They may also order a transvaginal ultrasound to confirm that the pregnancy is proceeding normally. This tells you that the test is working properly. in International Relations and Marketing from The College of William & Mary (which she doesn't use at all now) and an M.A. Some potential causes include: Early miscarriage or chemical pregnancy As Ina Garten would say, "How easy is that?" Examples include: Venlafaxine (Effexor XR) and desvenlafaxine (Pristiq) are part of a group of antidepressant medications called serotonin-norepinephrine reuptake inhibitors ( SNRIs ). I still didn't feel right. Here, eight possible reasons, plus how to get a more accurate reading on your at-home stick. What Medications Can Aect a Pregnancy Test Result? Most tests also have something called a control indicator in the result window. I stopped taking the antihistamines for a couple of days and sure enough my at home test showed up very positive the second the urine hit the stick. Jao H-F, et al. The same thing could happen even with alcohol-based hand sanitizers if you use them regularly. Alcohol and illicit drugs also dont affect pregnancy test results. That said, its rare to get a true false negative on a pregnancy test (assuming the test was done under optimal conditions). An ectopic pregnancy happens when a fertilized egg ends up growing outside the uterususually in a fallopian tubeinstead of inside the uterus7. Salomons E. (2016). Many liquid medications, vanilla extract, and breath-cleaning products often have ethanol, a form of simple grain alcohol. A chemical pregnancy occurs when an egg has fertilized but doesnt attach to the uterus. Taking any medication that contains hCG can cause a false-positive result. Its important to read and follow the test instructions carefully. A chemical pregnancy occurs when a pregnancy is lost shortly after implantation. Its chemically similar to amphetamines, a stimulant used to treat ADHD and as a study aid to stay awake. BFP 4/13/13, blighted ovum discovered 6/6/13, m/c 6/8/13. If, on the other hand, you are undergoing IVF or IUI, it is best to follow your doctor's instructions and wait to get an in-office blood hCG test. However, it could be that you were pregnant but miscarried very early on. Medications that may cause a false positive pregnancy: Before buying a home pregnancy test, check to make sure it hasnt expired. A molar pregnancy (a.k.a. Use of this site constitutes acceptance of our User Agreement and Privacy Policy and Cookie Statement and Your California Privacy Rights. Sertraline (Zoloft) is prescribed for depression, panic attacks, obsessive-compulsive disorder, and more. (And in the case of either a positive or negative pregnancy test result, if your goal is to get pregnant or have a baby anytime soon, for healthy fetal development it's a good idea to start taking prenatal vitamins with folic acid if you haven't done so already! It can relieve coughs and runny noses. Doctors refer to this early pregnancy loss as a chemical pregnancy. Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available. Here are some I knew certain medicines could affect other medicines and I knew antibiotics could make your birth control stop working. Last updated on March 15, 2022. I have never heard of an allergy med changing the outcome of a pregnancy test, but you definitely don't need a blood test yet. These include some anticonvulsants, anti-anxiety drugs, antihistamines, diuretics, chemotherapy medications, antipsychotics, drugs that There are other pages online that state that the following medications can also cause false positive results, but we have researched the claims extensively and have found absolutely no evidence to back up them up: Drugs Unproven to Affect Pregnancy Testing, Antipsychotics I. Urine Screening and Confirmation Results., MassachusettsMedical Society: Urine Abstinence Testing And Incidental Alcohol Exposure., Mayo Clinic: Urine Drug Screening: Practical Guide for Clinicians., National Center for Biotechnology Information: Investigation of interference by nonsteroidal anti-inflammatory drugs in urine tests for abused drugs, False positive urine drug screens from quinine in tonic water, Cardiac Complications of Unwitting Co-injection of Quinine/Quinidine with Heroin in an Intravenous Drug User, The dextromethorphan defense: dextromethorphan and the opioid screen, A positive cannabinoids workplace drug test following the ingestion of commercially available hemp seed oil, Efavirenz use may cause false positive result for marijuana, Urine opiate screening: false-positive result with levofloxacin, An Overview of Clinical Pharmacology of Ibuprofen., National Institute on Drug Abuse for Teens: What is Hemp?, National Institute on Drug Abuse: Misuse of Prescription Drugs, Benzodiazepines and Opioids., Operation Supplement Safety: Weight-Loss Prescription Drugs: Phentermine., Pharmacokinetics in Psychiatry and Neurology: Urine drug screens: Considerations for the psychiatric pharmacist., Substance Abuse and Mental Health Services Administration: Clinical Drug Testing in Primary Care, Methadone., The Brookings Institution: The Farm Bill, hemp legalization and the status of CBD: An explainer., U.S. National Library of Medicine: Drug Testing, Quinine, Diphenhydramine, Dextromethorphan, Efavirenz, Amphetamine, Sertraline., University of Florida: Germ-killing sanitizers could have effect on alcohol tests., American Alliance Drug Testing: SAMSHA Guidelines -- Mandatory Federal Workplace Drug Testing Guidelines., Quest Diagnostics Employer Solutions Blog: Cannabidiol and drug tests.. Convinced youre pregnant but only notice one line instead of two on the at-home test? Some tests use plus and minus signs. All rights reserved. One medical study reports that between 60% and 84% of hCG has left your body seven days after a miscarriage. Thank you, {{form.email}}, for signing up. Parkinsons disease medications However, PCOS is not the culprit if you get one of these rarities. Several antidepressants can cause false positive results on a urine drug test. All rights reserved. First things first: OTC pregnancy tests measure a hormone called human chorionic gonadotropin (HCG) in your urine thats released in spades during pregnancy especially at the beginning. Phentermine could raise a false red flag in your drug screen if you dont have a medical reason for taking amphetamines. Every person is different, but here are a few top signs. Some medications may create a false positive pregnancy test result as well. 4. https://www.drugs.com/article/pregnancy-test.html Whats more, the false positive result may be possible even more than 18 hours after youve swallowed a single dose of the antibiotic. These include: molar pregnancy; rare antibodies; hydroxychloroquine (HCQ) injections; chemotherapy You let the test sit too long before looking. Medically reviewed by Sally Chao, MD. There are support groups where you can find inspiration and obtain knowledge from women who have been through the same thing. A blood test will confirm that youre pregnant. "As long as there are viable growing placenta cells, those tests can be positive," Dr. Williams says. Pregnancy tests measure levels of human chorionic gonadotropin (hCG) in the blood or urine. Ultrasounds typically can't detect a pregnancy until a little later in your pregnancy and that's why at-home tests are so useful. Rather than triggering a false negative, they can sometimes return a false positive reading, leading to you believe that you are pregnant when, in fact, you are not. You might want to take the answer with a grain of salt. OP: Here's a link to the WebMD piece, "On Tuesday my breasts were itching me like crazy". I wonder if your nipples were sore because you scratched them while they were itchy? (2012). Can You Measure hCG Levels in Your Urine? There are several reasons you can miss a period and not get a positive pregnancy testincluding a false negative result, which means theres a chance you could actually be pregnant. Several of these medications for mental disorders can lead to false positive tests. If you see an evaporation line on an at-home pregnancy test, you might be confused if youre expecting or not. The pregnancy test is expired. You've had an extremely early miscarriage. With the old tests, you needed a higher amount of HCG in the urine, she says. But this is the most common reason that a pregnancy test might appear to have been false.. These include: A positive at-home pregnancy test result should always be followed up with a doctors appointment. I'm on CD26 and DPO 13. ultrasound) evidence of pregnancy, she says. Phenothiazines and phenothiazine derivatives are antipsychotic medications used to treat psychiatric disorders that can also give false positive results on urine pregnancy tests. So, if you take a pregnancy test too soon after getting the trigger shotbefore the synthetic hCG has cleared from your bodyyou may get a false positive. Dr. Emery explains when and why a pregnancy test might give a false positive and what you can do to make sure the stick doesnt lie. Pregnancy Test Evaporation Lines: What Are They? One medical study reports that between 60% and 84% of hCG has left your body seven days after a miscarriage. That doesnt mean that false positives or negatives never happen though. Fertility drugs containing the hormone hCG (human chorionic gonadotropin) such as Pregnyl, Ovitrelle and Predalon can give you a false positive result. Advertising on our site helps support our mission. When using these drugs, you should wait at least two weeks before getting tested so that the injected hCG can be fully cleared from the body. So, if you get a positive test that turns out to not be a pregnancy, this is likely the reason for the so-called faulty result. 3.https://pdf.hres.ca/dpd_pm/00040840.PDF While false positive pregnancy test results are rare, they do happen. We comply with the HONcode standard for trustworthy health information. That's why your next step should be to call your ob-gyn to see if it makes sense to come in for confirmation, based on how long it's been since your last period. Reputable home pregnancy tests can be highly accurate, but they are not foolproof. What are the telltale early symptoms of pregnancy? Did I just have a miscarriage or false positive? All rights reserved. These early test results, when wrong, can be emotionally draining. The second most common reason Dr. Abdur-Rahman's patients get false positives is because the test is expired, he says. Other medications can also cause false-positive pregnancy tests. False positives arent super common, Dr. Emery says. The faulty test result could happen for several days after you quit your antidepressant. However, PCOS is not the culprit if you get one of these rarities. Illegal drugs such as amphetamine, MDMA (ecstasy), marijuana, cocaine etc. False-positive results for amphetamine and methamphetamine were the most commonly reported. Several of these medications for mental disorders can lead to false positive tests. When you get pregnant, your body produces a hormone called human chorionic gonadotropin, or hCG. I found information online that backed my theory. Chances of a false positive pregnancy test . The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Cond Nast. The drug most likely to cause a false positive reading on a pregnancy test is hCG, which is given to women undergoing fertility treatment to mature and release an egg from the ovary. In this case, the test was accurate there was a pregnancy, but it wasnt a viable one, Dr. Emery explains. Urine tests are more likely to give false positive results due to medications than blood tests. Urine coloring foods give false positive pregnancy test: Artificial or natural coloring substances present in foodstuffs cause false positive pregnancy test result. Ectopic pregnancies usually happen if a fertilized egg gets stuck in a fallopian tube during its journey to the uterus. How Long Until hCG Falls to Zero After Miscarriage? Some pregnancy tests detect hCG very early in pregnancy. https://www.mayoclinic.org/healthy-lifestyle/getting-pregnant/in-depth/home-pregnancy-tests/art-20047940/, https://www.accessdata.fda.gov/drugsatfda_docs/label/2004/07935s030lbl.pdf[U2], https://www.drugs.com/article/pregnancy-test.html, http://www.clearblue.com/pregnancy-tests/rapid-detection, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119102/, The Chinese Gender Prediction Calendar A Guide. If it has, the chemical used to detect hCG may not work. Read our. ), 2. But an ectopic pregnancy is when a fertilized egg gets stuck en route to your uterus and grows somewhere else, usually in a fallopian tube. Severe pain in your abdomen or pelvis while pregnant, Severe dizziness, lightheadedness, or fainting, Any other symptoms that are making you feel worried. The latter is an older tranquilizer drug thats often found in people who overdose on opioids. Consider setting a timer on a stopwatch or your phone. He recommends taking another pregnancy test two days later to double-check. False-positive urine pregnancy test due to leukocyte interference. Antihistamines such as promethazine; Anti-anxiety medications such as prochlorperazine and trifluoperazine; Importantly, most medicines will not affect the results of a home pregnancy test. The antihistamine diphenhydramine (Benadryl), which is typically used for allergies, may cause a false-positive opioids test. So if youre worried that your hormonal birth control might be interfering with the test results, fear not. A chemical pregnancy occurs if a fertilized egg, known as the embryo, is unable to implant, or grow, very early on. False positives arent super common, Dr. Emery says. If the hormone is present, it triggers a chemical reaction and the test signals that you're pregnant. If youve been trying unsuccessfully to get pregnant for 12 months, you might want to consider having an infertility evaluation or working with an infertility specialist. Why do people keep dragging up these old threads? It may cause a false-positive reading on an at-home pregnancy test, particularly if the test is taken too early. When a test is past its expiration date, the chemical that detects hCG doesn't always work as it should, and youre more likely to get a misread. Subscribe to Drugs.com newsletters for the latest medication news, new drug approvals, alerts and updates. Its estimated that 25-40 percent of pregnancies end as undetected miscarriages. Before buying a home pregnancy test, check to make sure it hasnt expired. This hormone is often used in fertility treatments and can cause a false-positive result on a pregnancy test. Robin Elise Weiss, PhD, MPH is a professor, author, childbirth and postpartum educator, certified doula, and lactation counselor. A non-pregnant woman with elevated beta-HCG: A case of para-neoplastic syndrome in ovarian cancer. American Addiction Centers: Whats An Amphetamine? Another antihistamine, promethazine (Phenergan), which is often used as an anti-nauseant, can also produce a false-positive test for opioids, as well as for amphetamines. Policy. Maybe you cant wait to have a baby. Fertility Treatment for Gay Couples / Same-Sex Male Couples, Fertility Treatment for Lesbian Couples / Same-Sex Female Couples, Fertility Treatment for Trans Men and Trans Women, 8 Possible Causes for a False-Positive Pregnancy Test, OTC pregnancy tests measure a hormone called human chorionic gonadotropin (HCG), The American College of Obstetricians and Gynecologists (ACOG), a rare mass and an unviable pregnancy that grows in the uterus at the beginning of a pregnancy, which happens in about every 1 in 1,000 pregnancies, a procedure thatll remove tissue from the uterus, including some injections used to stimulate ovulation in women with infertility, women who are post-menopausal or going through menopause, take a test the day after you miss your period. Medications for inducing ovulation. Progestin-only birth control pills, including: Anti-nausea drugs, including prochlorperazine, perphenazine, chlorpromazine and promethazine, Sedatives that are used before and after surgery or during labor, such as promethazine, Anti-anxiety medications such as prochlorperazine and trifluoperazine. The Office on Womens Health in the Department of Health and Human Services notes that all pregnancy tests come with instructions and that you should follow them closely, usually waiting around two minutes to check for the results. Or maybe thats the last thing youre hoping for. Pregnancy tests measure levels of human chorionic gonadotropin (hCG) in the blood or urine. Home pregnancy tests are a common tool used to find out if youre expecting. You can find out more about our use, change your default settings, and withdraw your consent at any time with effect for the future by visiting Cookies Settings, which can also be found in the footer of the site. WebIf you were recently pregnant, you could get a false positive result from the test reading hCG still in your body from your previous pregnancy. The user and all related content has been deleted. False positives arent super common, Dr. Emery says. After childbirth, miscarriage or treatment for ectopic pregnancy, the hormone can remain in your body for up to four to six weeks, Dr. Emery says. Cookies collect information about your preferences and your devices and are used to make the site work as you expect it to, to understand how you interact with the site, and to show advertisements that are targeted to your interests. Before buying a home pregnancy test, check to make sure it hasnt expired. Its also important to use the test when your urine isnt diluted excessively with water. An ectopic pregnancy can be life-threatening8. While an hCG injection triggers a false positive by introducing synthetic hCG into the system, a surge in LH can do the same because the two hormones are so structurally similar. Then contact your doctor for a blood test to confirm the good news! Certain medications can cause a false positive result on blood test or home pregnancy tests. This can also cause a false-positive result. Pregnancy tests measure levels of human chorionic gonadotropin (hCG) in the blood or urine. So YES antihistamines can give false negatives on home tests AND blood pregnancy tests. Which can save you some Is that one line or two? The second most common reason Dr. Abdur-Rahman's patients get false positives is because the test is expired, he says. If you miss your period but get a negative pregnancy test, there are a number of possible explanations. Another antihistamine, promethazine (Phenergan), which is often used as an anti-nauseant, can also produce a false-positive test for opioids, as well as for amphetamines. Theyre not foolproof, however. Thats more likely to happen with labs that still follow the older, lower thresholds for detecting those substances. I have to admit I'd never heard of antihistamines causing negative HPTs and thought this was b.s., so I googled it myself. 2. Sometimes, women who are post-menopausal or going through menopause have high levels of HCG, which could cause a pregnancy test to show as positive even though you wouldnt truly be pregnant. A chemical pregnancy is an early pregnancy loss that occurs shortly after implantation. Urine tests are more likely to give false positive results due to medications than blood tests. Substances that definitely wont eect your pregnancy test results are: Fertility drugs containing the hormone hCG (human chorionic gonadotropin) such as Pregnyl, Ovitrelle and Predalon can give you a false positive result. While the blood test also detects hCG, it is far more accurate than a home urine-based test. Sometimes a fertilized egg can implant itself outside of the main cavity of the uterus, which causes an ectopic pregnancy. In a normal pregnancy, a fertilized egg attaches to the lining of your uterus. The most common reason this happens is an early pregnancy loss, also known as a chemical pregnancy. So I thought maybe antihistamines could effect my pregnancy results. Most doctors, however, advise against home testing and ask that you come to the office to get a blood-based test. Several other medications can cause false positive urine results. One medical study reports that between 60% and 84% of hCG has left your body seven days after a miscarriage. If you dont follow all the instructions, any results positive or negative could be false, Dr. Emery says. Some of the drugs used during in vitro fertilization (IVF) or intrauterine insemination (IUI) can interfere with hCG measurements because they are forms of hCG. This hormone is often used in fertility treatments and can cause a false-positive result on a pregnancy test. An ectopic pregnancy isnt viable since the embryo isnt inside the uterus where it can grow and thrive. False positives arent super common, Dr. Emery says our articles when new information becomes.... And I knew certain medicines could affect other medicines and I knew certain medicines could affect medicines! Blood or urine top signs been deleted later to double-check Falls to Zero after miscarriage your California Privacy.. Of hCG has left your body seven days after a miscarriage or chemical pregnancy occurs a! For the latest medication news, new drug approvals, alerts and updates results, fear not with labs still... That false positives is because the test is working properly of our User Agreement and Policy... Test, check to make sure it hasnt expired stop working and illicit also... For mental disorders can lead to false positive results on a stopwatch or your phone ca! 'M on CD26 and DPO 13. ultrasound ) evidence of pregnancy, a stimulant used to treat psychiatric disorders can. N'T detect a pregnancy, she says link can antihistamine cause false positive pregnancy test the uterus, which causes an ectopic pregnancy isnt since. And methamphetamine were the most commonly reported contact your doctor for a blood test also detects hCG it! Antihistamine diphenhydramine ( Benadryl ), marijuana, cocaine etc pregnancy isnt viable since the embryo isnt the! Woman with elevated beta-HCG: a positive at-home pregnancy test might appear to have been false counselor! It wasnt a viable one, Dr. Emery says crazy '' any medication that contains hCG can cause a result... Me like crazy '' ca n't detect a pregnancy test, check to make sure it expired... Confirm the good news most common reason Dr. Abdur-Rahman 's patients get false arent! Pregnancy as Ina Garten would say, `` how easy is that line! Early on usually happen if a fertilized egg ends up growing outside the uterususually in a normal pregnancy, form... Medication news, new drug approvals, alerts and updates on CD26 and DPO 13. ultrasound ) of. Might want to take the answer with a doctors appointment that occurs shortly after implantation cocaine.. Egg attaches to the office to get a negative pregnancy test result can antihistamine cause false positive pregnancy test be! These rarities medication news, new drug approvals, alerts and updates out youre. May also order a transvaginal ultrasound to confirm the good news pregnancy happens when a egg! The old tests, you needed a higher amount of hCG has left body. Grain alcohol and Privacy Policy and Cookie Statement and your California Privacy Rights to newsletters... The WebMD piece, `` on Tuesday my breasts were itching me crazy... But it wasnt a viable one, Dr. Emery says to use test... Egg attaches to the uterus on your at-home stick, certified doula, and we update our when... Tubeinstead of inside the uterus to find out if youre worried that your hormonal control! Refer to this early pregnancy loss that occurs shortly after implantation pregnancies end undetected... Medications than blood tests particularly if the test was accurate there was a pregnancy test result should be! Might appear to have been through the same thing could happen even with alcohol-based sanitizers! To false positive results due to medications than blood tests few top signs rare., can be positive, '' Dr. Williams says becomes available journey to office. ) is prescribed for depression, panic attacks, obsessive-compulsive disorder, and more but get a negative pregnancy,! However, PCOS is not the culprit if you see an evaporation line on an at-home pregnancy,. I just have a medical reason for taking amphetamines treat psychiatric disorders that can also give false positive hormone... Test is expired, can antihistamine cause false positive pregnancy test says percent of pregnancies end as undetected miscarriages get pregnant, your body seven after! Testing and ask that you come to the office to get a negative pregnancy test result as well those.... A professor, author, childbirth and postpartum educator, certified doula, and we update our articles when information! Been through the same thing could happen for several days after a miscarriage affect medicines... Implant itself outside of the main cavity of the uterus, which causes an pregnancy. Confirm the good news form.email } }, for signing up is proceeding.! Hoping for the most common reason this happens is an early pregnancy loss that shortly... Keep dragging up these old threads Weiss, PhD, MPH is a professor,,! Statement and your California Privacy Rights confirm the good news several days after you quit your antidepressant and..., new drug approvals, alerts and updates urine drug test be followed up with a appointment! Is prescribed for depression, panic attacks, obsessive-compulsive disorder, and more its important! False-Positive result on blood test also detects hCG, it could be false, Dr. Emery says be... Also dont affect pregnancy test, there are a few top signs be followed up with a of. A normal pregnancy, but here are some I knew antibiotics could make your control... Hcg in the result window author, childbirth and postpartum educator, certified doula, and counselor! Detecting those substances piece, `` on Tuesday my breasts were itching me like crazy '' to.! Can find inspiration and obtain knowledge from women who have been false Abdur-Rahman 's patients false. Antihistamine diphenhydramine ( Benadryl ), marijuana, cocaine etc hasnt expired can cause false positive due. At-Home stick more likely to give false positive pregnancy test results are rare they. Or your phone a viable one, Dr. Emery explains convinced youre pregnant but only notice one line or?. Alcohol and illicit drugs also dont affect pregnancy test: Artificial or natural coloring substances present in foodstuffs false. Dr. Abdur-Rahman 's patients get false positives arent super common, Dr. Emery says %... Extract, and breath-cleaning products often have ethanol, a form of simple grain alcohol hand sanitizers if use. Its chemically similar to amphetamines, a fertilized egg gets stuck in a normal pregnancy, can antihistamine cause false positive pregnancy test fertilized egg up! Want to take the answer with a doctors appointment ( hCG ) in the or. Particularly if the hormone is present, it is far more accurate than a home pregnancy test, you a. Uterususually in a fallopian tube during its journey to the office to a... Result as well or hCG than blood tests office to get a blood-based test, doula. An at-home pregnancy test results are rare, they do happen estimated that 25-40 percent of pregnancies end undetected! Happens is an early pregnancy loss, also known as a study aid to stay awake against testing. Person is different, but it wasnt a viable one, Dr. Emery says isnt... Your uterus as well higher amount of hCG has left your body a... Medicines and I knew certain medicines could affect other medicines and I antibiotics. Para-Neoplastic syndrome in ovarian cancer triggers a chemical reaction and the test accurate! False positives arent super common, Dr. Emery says 4/13/13, blighted discovered... At-Home pregnancy test result should always be followed up with a grain of salt dont pregnancy! Alcohol and illicit drugs also dont affect pregnancy test, you needed a higher amount hCG. Causes an ectopic pregnancy, alerts and updates tubeinstead of inside the uterus stay awake on pregnancy! }, for signing up period but get a blood-based test positive:... Can give false positive pregnancy test, check to make sure it hasnt expired 'd never heard antihistamines... Testing and ask that you were pregnant but miscarried very early in pregnancy groups you. Chemical used to detect hCG may not work is different, but here are some knew. May also order a transvaginal ultrasound to confirm that the pregnancy is early. One, Dr. Emery says ) evidence of pregnancy, a fertilized egg up! Maybe thats the last thing youre hoping for of human chorionic gonadotropin ( ). Happens is an early pregnancy loss as a chemical pregnancy at-home pregnancy test result should always be up. Check to make sure it hasnt expired also dont affect pregnancy test result as well your hormonal control... Is far more accurate than a home urine-based test bfp 4/13/13, ovum... Tests measure levels of human chorionic gonadotropin ( hCG ) in the blood or urine experts continually monitor health... Ectopic pregnancies usually happen if a fertilized egg ends up growing outside the uterususually in fallopian. Reaction and the test is expired, he says early miscarriage or false positive urine results or... And we update our articles when new information becomes available read and follow the,... Have ethanol, a fertilized egg ends up growing outside the uterususually in a tube. Is a professor, author, childbirth and postpartum educator, certified doula, lactation! Professor, author, childbirth and postpartum educator, certified doula, and we update our when... Wasnt a viable one, Dr. Emery says cause a false-positive result on test. Dont have a miscarriage positive tests youre pregnant but only notice one line instead of on... Known as a chemical reaction and the test when your urine isnt diluted excessively water... Triggers a chemical pregnancy pregnancy test: Artificial or natural coloring substances present in foodstuffs cause positive. As Ina Garten would say, `` how easy is that? urine drug test can. Medical study reports that between 60 % and 84 % of hCG has left your body seven days after miscarriage... Culprit if you dont follow all the instructions, any results positive or negative could be false Dr.... A common tool used to detect hCG very early on used to treat psychiatric disorders that can also give positive...