2023 Cond Nast. 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. You may get a false positive on a pregnancy test for a number of reasons, including if you take the test too early or are taking certain fertility medications. Severe pain in your abdomen or pelvis while pregnant, Severe dizziness, lightheadedness, or fainting, Any other symptoms that are making you feel worried. ultrasound) evidence of pregnancy, she says. Thankfully, experts note that false positive pregnancy tests are rare. Pregnancy tests measure levels of human chorionic gonadotropin (hCG) in the blood or urine. False-positive results for methadone, opioids, phencyclidine, barbiturates, cannabinoids, and benzodiazepines were also reported in patients taking commonly used medications. Salomons E. (2016). Working one-on-one with a therapist, family member, or trusted friend can also be beneficial. First off, dont panic. Home pregnancy tests measure levels of human chorionic gonadotropin (hCG) hormone in urine. The hope that comes with seeing that positive sign crashing down as you realize it was a false positive pregnancy test? To avoid confusion, you may want to alert the lab or the clinic beforehand that youre on efavirenz. Discover the best time to be tested for HIV. Alikhan M, et al. Anti-anxiety medications Its chemically similar to amphetamines, a stimulant used to treat ADHD and as a study aid to stay awake. Copyright 2020 Pregged.com. Thorazine (chlorpromazine) is the most commonly used drug in this class, The Columbia Encyclopedia states. A poppy seed bagel, for example, might make you test positive for both of those opioids for up to a whole day after you eat it. If youve had a baby recently or a miscarriage, you may test positive for pregnancy. If you dont miscarry naturally and you notice severe abdominal or pelvic pain with bleeding, extreme lightheadedness, or shoulder pain see your doctor ASAP. That might cause the test to look like it has a faint second linemaking it positivebut it really only has one. Pregnancy Test Evaporation Lines: What Are They? Here, eight possible reasons, plus how to get a more accurate reading on your at-home stick. However, it could be that you were pregnant but miscarried very early on. Ovidrel Trigger Shots for Fertility Treatment. (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! False positives arent super common, Dr. Emery says. On Tuesday my breasts were itching me like crazy. A chemical pregnancy occurs when a pregnancy is lost shortly after implantation. "As long as there are viable growing placenta cells, those tests can be positive," Dr. Williams says. Cleveland Clinic, Your Guide to Pregnancy Tests, First Response, Early Pregnancy Test Result, American College of Obstetricians and Gynecologists, Early Pregnancy Loss, The Journal of Clinical Endocrinology and Metabolism, Hypothesis: Persistently Elevated hCG Causes Gestational Ovarian Overstimulation Associated With Prolonged Postpartum Hyperandrogenism in Mothers of Aromatase-Deficient Babies, 8 Pregnancy Pains That Are Totally Normal (Yes, Including Lightning Crotch), I'm Glad I Shared My Pregnancy News 'Early'Even Though I Miscarried. An ectopic pregnancy can just happen, but risk factors include: Ectopic pregnancies can also occur in the cervix, ovary, or abdominal cavity. One medical study reports that between 60% and 84% of hCG has left your body seven days after a miscarriage. While the blood test also detects hCG, it is far more accurate than a home urine-based test. If you're experiencing cramping but don't get your period, you might be pregnant. While it's not common, other types of medications can also prompt a false positive pregnancy test result. These include: molar pregnancy; rare antibodies; hydroxychloroquine (HCQ) injections; chemotherapy Ectopic pregnancies can cause your fallopian tube to burst and, without treatment, can be life-threatening. Sometimes a fertilized egg can implant itself outside of the main cavity of the uterus, which causes an ectopic pregnancy. Some potential causes include: Early miscarriage or chemical pregnancy But the embryo will still produce hCG, which can lead to a positive pregnancy test, even though the pregnancy isn't viable. Pregnancy tests measure levels of human chorionic gonadotropin (hCG) in the blood or urine. This line may represent an early pregnancy, or it may be an evaporation line. Even if you cant take time off, you can still take care of yourself. Other factors that can cause inaccurate results on pregnancy tests may include: The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. Also learn how doctors may monitor someones condition for changes after theyve contracted HIV. But you still have to pay attention since a mistake can lead to incorrect results. 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. It may cause a false-positive reading on an at-home pregnancy test, particularly if the test is taken too early. This hormone is often used in fertility treatments and can cause a false-positive result on a pregnancy test. The medication can cause a false-positive result if you take the test too soon after a missed period. According to the Cleveland Clinic, hCG can usually be detected in urine roughly 10 days after conception, so taking a test too early can result in a false negative test result. Parkinsons disease medications That could lead to a positive pregnancy test when your body just hasnt cleared the hCG yet.. Fertility Plus recommends waiting 7 days after a 2,500 International Unit (IU) injection, 10 days after a 5,000 IU injection, and 14 days after a 10,000 IU injection to test. Check out our Zodiac Center! If you miss your period but get a negative pregnancy test, there are a number of possible explanations. Home pregnancy tests work by detecting the presence of human chorionic gonadotropin (hCG) in a urine sample. Pacific Fertility Center: Progesterone 101. False-positive urine pregnancy test due to leukocyte interference. Home pregnancy tests look for that hormone in your urine. You must wait up to 10 days after administration of fertility drugs, to take a pregnancy test. Alcohol and illicit drugs also dont affect pregnancy test results. Thanks everyone - if AF does not show up I'll test again on Monday. 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. Phentermine is a prescription medicine that helps curb your appetite. Typically, it takes about 10 days for the synthetic hCG in these trigger shots to clear from your blood and urine. Urine coloring foods give false positive pregnancy test: Artificial or natural coloring substances present in foodstuffs cause false positive pregnancy test result. If hCG is not present, the test will say you aren't pregnant. Ad Choices. Basically, sperm did indeed fertilize an egg and an embryo was created even implanted but it did not progress very far, she says. According to the Cleveland Clinic, hCG can usually be detected in urine roughly 10 days after conception, so taking a test too early can result in a false negative test result. Before buying a home pregnancy test, check to make sure it hasnt expired. The best thing to do when youve gotten a positive result is to contact your doctor. So YES antihistamines can give false negatives on home tests AND blood pregnancy tests. While todays technology can technically deliver a positive result in at-home tests before you even miss your period, your best bet for accuracy is to take a test the day after you miss your period, per The Mayo Clinic. Many tests use two lines to mean youre pregnant and one line to mean youre notbut it depends on the test brand. Check the expiration date before using the test. Learn about potential problems associated with rheumatoid arthritis and pregnancy, including triggers, preeclampsia, premature birth, and low birth, Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. Examples include: Venlafaxine (Effexor XR) and desvenlafaxine (Pristiq) are part of a group of antidepressant medications called serotonin-norepinephrine reuptake inhibitors ( SNRIs ). Common hMG medications include Menopur, Pergonal, and Repronex.. Some women also take hCG to help them lose weight. Another possibility is if you have had an ectopic pregnancy in the past. 2023 Dotdash Media, Inc. All rights reserved. Rarely, certain medical conditions can cause a home pregnancy test to give a false positive. Addiction: Signs, Symptoms, and Treatment., American Association for Clinical Chemistry: Rifampin Interference with Opiate Immunoassays., Drug Enforcement Administration: Dextromethorphan., FDA: Zoloft (sertraline hydrochloride) Label., Journal of Analytical Toxicology: Non-Smoker Exposure to Secondhand Cannabis Smoke. 1. In this case, the test was accurate there was a pregnancy, but it wasnt a viable one, Dr. Emery explains. One of these is the synthetic hCG trigger shot, sold under the following brand names: The hCG shot helps follicles release mature eggs. You might get your period a few days after a positive pregnancy test and assume you had a false positive result. Some medications may create a false positive pregnancy test result as well. Another possibility is if you have had an ectopic pregnancy in the past. Certain medications can cause a false positive result on blood test or home pregnancy tests. Perkins also has extensive experience working in home health with medically fragile pediatric patients. 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. Get a positive result or just simply confused about whats going on? In a normal pregnancy, a fertilized egg attaches to the lining of your uterus. HCG is short for human chorionic gonadotropin, which the body creates during pregnancy. One study published in The Journal of Clinical Endocrinology and Metabolism estimates that it takes four to six weeks for hCG levels to return to normal after a person has a miscarriage6. Another type of injectable drug, known as human menopausal gonadotropin (hMG), can be used to aid in ovulation. Women ages 35 and older who have been trying unsuccessfully to get pregnant for 6 months are recommended to seek an infertility evaluation. 2. Its important to read and follow the test instructions carefully. If it has, the chemical used to detect hCG may not work. What is a pregnancy test? The thing is, a fertilized egg cant survive outside of the uterus. While its not as common as a false negative, its possible for any person to get a false positive on a pregnancy test. If you take a pregnancy test too soon after taking a fertility drug that contains hCGlike some injections that are often part of in vitro fertilizationyou could get a false positive. But there are some reasons you might get a false-positive result.. False positive results are uncommon on pregnancy tests; false negatives are much more common. CCRM Fertility. As Ina Garten would say, "How easy is 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 If it has, the chemical used to detect hCG may not work. A chemical pregnancy occurs when an egg has fertilized but doesnt attach to the uterus. Test once a week until you get a positive, your period or you reach 60 days without your period and then go to the doctor. 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. Female age-related fertility decline. All rights reserved. You're right -- a bunch of credible stuff came up in my search! If you wait too long to read the results, for example, or use more drops of urine than the test calls for? Librium (chlordiazepoxide), an anti-anxiety medication also used to control agitation during alcohol withdrawal, can cause false positive pregnancy results in urine pregnancy tests, Medline Plus states, but blood tests will not show false positive results. Women unable to ovulate on their own are often prescribed a fertility medication such as Clomid (clomiphene citrate). They include but arent limited to: Rarely, certain medical conditions can cause a home pregnancy test to give a false positive. Thats most likely to happen right after youre exposed to the smoke. A registered nurse with more than 25 years of experience in oncology, labor/delivery, neonatal intensive care, infertility and ophthalmology, Sharon Perkins has also coauthored and edited numerous health books for the Wiley "Dummies" series. Usually yes, but sometimes no. 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