Women can stop having regular periods for many reasons, including diabetes, eating disorders, excessive exercise, stress, obesity, very low body fat, or some medications. If you miss more than three periods in a row and pregnancy tests are all negative, see your doctor for a thorough evaluation. Although rare, this can happen if you experienced a pregnancy loss, or if you took a pregnancy test too soon after taking a fertility drug that contains hCG. You could have had a false-positive pregnancy test, meaning your test result says you're pregnant when you're actually not. What if I have a positive pregnancy test and then test negative? This is known as the "hook effect." This can happen if you're further along in your pregnancy or if you're carrying twins or triplets. Occasionally, extremely high levels of hCG prevent home pregnancy tests from being able to properly read the result, and the read ends up being negative. Can twins cause a false negative pregnancy test? It's called a "false negative" pregnancy test result. In fact, some researchers estimate this happens with up to 5 percent of home pregnancy tests. Yes, it's possible to be pregnant and have a negative pregnancy test result. Is it possible to have a negative pregnancy test but still be pregnant? These tests are more accurate than urine pregnancy tests. If you suspect your pregnancy test result is a false negative, ask your doctor for a blood pregnancy test. Check the outside of the package for the expiration date and storage instructions. The test expired or wasn't stored properly.Make sure you didn't check the results too soon. You didn't follow the test instructions correctly.It's also possible that you ovulated later than you think, and not enough days have passed since the time of conception to get a positive pregnancy test result. Sperm can live in the fallopian tubes for up to five days, so it's possible you conceived several days after having sex. Don't time the test based on when you think you might have conceived. That's the time when your urine – and any hCG – is the most concentrated. For the most accurate result, take the test when you first get up in the morning. Your hormone levels were too low or diluted.Some tests can detect hCG the first day you miss your period (or soon after). A home pregnancy test will be positive only if it detects the pregnancy hormone hCG. But, you could still be pregnant and get a negative test result because: What does a negative pregnancy test mean?Ī negative pregnancy might mean you're not pregnant. If you have a late or missed period and a negative pregnancy test, talk to your healthcare provider, who can do a blood test to determine whether you're pregnant. A false negative pregnancy test can happen because you conceived later than you think, you didn't take the test correctly, your urine was diluted, or even because you're pregnant with multiples. But that doesn't always mean you're not pregnant. A negative pregnancy test means the test didn't detect the pregnancy hormone hCG in your urine.
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