can a negative pregnancy test turn positive after a few days?
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If the result is negative, it may be a good idea to take another test in a few days, to give hCG levels a chance to rise. Very few medications, including fertility drugs, may cause false positives. Otherwise, a positive result followed by a negative result a few days later could mean a very early pregnancy loss.
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A negative pregnancy test result means the test hasn't detected hCG in your urine. If your period is very late, or you've skipped your period, and you get a negative result, you are unlikely to be pregnant.
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One explanation for a false negative pregnancy test is what's called the hook effect. It's not common but sometimes this effect leads to urine and blood tests giving the wrong result. This error might happen even after you've had one positive pregnancy test and test again a couple days later.
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If you have a negative test but think you might be pregnant, repeat the test one week after your missed period or talk to your health care provider.
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If you happen to be like many women and keep the test around to look at later, you may notice that after that allotted time, the test now appears to have a positive result. This is called an evaporation line. It is not indicative of a positive pregnancy test.
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Typically, this occurs six to 12 days after you've ovulated. “If you're comfortable with the fact that you might get a false positive, you can take a home pregnancy test just 10 days after unprotected sex,” says Dr. Felice Gersh, a board-certified OB-GYN. “Sometimes pregnancy tests will turn positive by then.
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It's not common but sometimes this effect leads to urine and blood tests giving the wrong result. This error might happen even after you've had one positive pregnancy test and test again a couple days later. No, you're not going crazy — and you're not necessarily miscarrying when this happens, either.
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You might get your period a few days after a positive pregnancy test and assume you had a false-positive result. However, it could be that you were pregnant but miscarried very early on. “It's not that the test is wrong—it was completely accurate at picking up the hormone [hCG]," Dr. Williams says.
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A line on a pregnancy test may show a positive result if: There is visible dye in the line, even if the color is faint. The line appears within the period specified on the instructions, which is usually 3–5 minutes. A woman has taken an early-result test at least 11 days after ovulation.
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A negative result can mean that you are not pregnant, you took the test too early, or you took the test wrong. Pregnancy tests vary in their sensitivity (how soon they can detect the hormone hCG), and you may not have given your body enough time to produce enough hCG hormones that will show up on the test.
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If the test result is negative, you may not be pregnant. However, negative results are less reliable. For example, if you do a pregnancy test too early, you could be pregnant, but there may not be enough HCG in your body to give a positive test result.
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False negative pregnancy tests do occur. In fact, it is possible to have a negative result on a pregnancy test and actually be pregnant.
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If taken correctly, these may deliver a positive result a day or two before your period is expected (say, at 12 DPO, not 10). But a negative may be false. That means waiting another few days and re-testing.
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Chemical pregnancy The most common explanation for a "false positive" is that you really were pregnant when you took the test. "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.
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Most pregnancy tests include instructions that encourage you to wait at least one week between a negative test and taking another pregnancy test. This is to allow time for your body to build up enough hCG (human chorionic gonadotropin) to be detected in your urine.
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If you follow directions, home pregnancy tests are an estimated 97% to 99% accurate. Yet if you get a negative result and suspect you're pregnant, check the instructions on the box. Home pregnancy tests typically recommend retaking the test 5 to 7 days later, when the hCG levels in your body will be higher.
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It takes about 2 weeks for your hCG levels to be high enough to be detected in your urine using a home pregnancy test. A positive home test result is almost certainly correct, but a negative result is less reliable. If you do a pregnancy test on the first day of your missed period, and it's negative, wait about a week.