can the morning after pill cause false positive pregnancy test?
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Causes of an incorrect test result. Though pregnancy tests are highly accurate, there's still room for error. A few issues can affect your results, but your birth control pill isn't one of them. The hormones in your birth control pill don't affect a test's ability to detect hCG.
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Taking antibiotics won't make your pregnancy test positive, but if you're on fertility medications, containing hCG (these are given by injection) you may get a false positive result.
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Irregular bleeding patterns are common among people taking levonorgestrel emergency contraceptive pill (5). If your period is more than one week late, it is recommended to take a pregnancy test (3). Remember, the emergency contraceptive pill is not a guarantee against pregnancy.
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False positive pregnancy tests are very rare. Most women will never have one. In fact, false positives are so rare that if a woman does have a positive test and later has a negative test, she should assume she had a very early miscarriage. If you test positive, try testing again a day later.
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If you really can't wait until morning, go ahead and take one. The only issue is it might be inaccurate. If the test comes back positive at night, then you are most likely pregnant, as it is pretty rare to get a false-positive result (but not impossible).
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Cue: panicked visit to your ob/gyn, only to learn that you're actually not pregnant and had nothing to stress about. Thankfully, false-positive pregnancy tests are rare, but they can happen. Here are some of the most common causes of a false-positive pregnancy test.
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A false-positive result indicates a pregnancy even though there isn't one. Rarely, the test may detect abnormal, non-pregnancy tissue, which requires follow-up by a doctor. These results are rare because usually only pregnant women produce the hCG hormone.
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False positive pregnancy test result – reasons you might get one. As what happened with New_here above, a pregnancy may initially be detected by an early pregnancy test, which will give you a positive result. But then, when you test again at a later time, you get a negative result.
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False negative pregnancy test – how common is it? Yes, wrong pregnancy test results can and do happen. In fact false negatives – where the pregnancy test says you're not pregnant but you actually are – are more common than false positives. However, it's also important to say that this shouldn't give you false hope.
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Most home pregnancy tests are reliable, for example Clearblue's tests have an accuracy of over 99% from the day you expect your period, and while it's possible a test showing a negative result is wrong, particularly if you're testing early, getting a false positive is extremely rare.
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"Some women can get a positive pregnancy test and then three days after their period is due, they have a really heavy period," says Lanalee Araba Sam, M.D., an ob-gyn in Fort Lauderdale. "Really what they've had is an early miscarriage called a chemical pregnancy, and a lot of people call that a false positive.
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Getting a true false positive – one where you were never pregnant in the first place – is incredibly rare. Pregnancy tests detect the hCG (human Chorionic Gonadotrophin) hormone in your body, which is only present when you're pregnant.
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Although many home pregnancy tests claim 99 percent accuracy, they are not perfect. A false-positive result is one where the test indicates that the user is pregnant when she is not.
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This is why a positive pregnancy test result will mean you are almost certainly pregnant. However, in rare instances, you can get a false positive from: a recent pregnancy (e.g. after miscarriage, recent birth or termination) some rare ovarian cysts.
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A few issues can affect your results, but your birth control pill isn't one of them. The hormones in your birth control pill don't affect a test's ability to detect hCG.
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['Applying apple juice directly to some brands of pregnancy test can produce a false positive result.', 'It does this by interacting with the enzymes in the test.', 'Drinking apple juice does not affect the results of a pregnancy test.']
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Rarely, certain medical conditions can cause a home pregnancy test to give a false positive. These include: urinary tract infection. kidney disease that causes blood or white blood cells in the urine.