HCG is at its highest level in the morning when urine is fresh and not diluted by the liquid you drink during the day. If you test in the afternoon, your urine may not have enough HCG to detect.
It's also possible to get a positive test result followed by a negative result. If you use two different pregnancy tests, this could be the result of varying test sensitivity. Wait a few days and test again. You also may no longer be pregnant.
You can do a pregnancy test on a sample of urine collected at any time of the day. It doesn't have to be in the morning.
You may get a different result with your first morning urine as there may have been too little of the hCG hormone in your urine at night to trigger a positive result.
However, false negatives can occur for a number of reasons, including people being tested too soon after exposure to the virus (which may not let enough of the virus build up to a level that is detectable), differences in how well the coronavirus is able to make copies of itself in one person compared to in another ...
Unfortunately, yes—it is possible.
Can Too Much Pee on a Pregnancy Test Make It Negative? Urinating too much on a urine pregnancy test should not cause a false negative result. But diluted urine, or urine with a higher water content, can impact a pregnancy test by skewing results.
It could simply be that your urine was more diluted today, meaning it was harder for the test to detect the hCG. Test again in the morning when the hCG should be most concentrated. If you tested today and the line seems lighter than your test from yesterday. Don't panic.
The good news for prospective testers is that the chances of a false positive pregnancy test are very low. So just how common are false positive pregnancy tests then? “False positive pregnancy tests are rare and occur less than 1 percent of the time,” confirms DuMontier.
Consider Taking a Second Test
Certainly, there's no harm in taking a second test. Human error and misreadings can occur—so a little validation can give you some peace of mind. It's true that an expired pregnancy test or, more commonly, user error can result in a false positive.
If you saw a faint positive result and retested in a few days with a negative result (or you got your period after testing positive), you may have experienced a chemical pregnancy or early miscarriage. A chemical pregnancy means the egg was fertilized but didn't completely implant.
In general, the best time is when you have your first morning pee. However, some pregnancy tests are sensitive enough to detect HCG no matter what time of day you take the test.
It appears shortly after the embryo attaches to the wall of the uterus. If you are pregnant, this hormone increases very rapidly. If you have a 28 day menstrual cycle, you can detect hCG in your urine 12-15 days after ovulation.
A positive result will last for at least 48 hours. However, a negative result may not last and should not be read after 10 minutes.
Taking the test in the morning is mostly recommended because of the concentration of the urine. Since you would not have drunk water or pee at night, the level of hCG will be higher in the urine and it will be easy to detect if you would be pregnant.
Yes, it is possible. Getting a negative result doesn't mean you're not pregnant, it may just mean your hCG levels are not high enough for the test to detect the hormone in your urine.
Lastly: sometimes twin or higher order multiple pregnancies, in which levels of hCG are very high, can cause a false negative pregnancy test. This is called the high-dose hook effect. 4 It's unusual, but possible. if you miss a period and have pregnancy symptoms, see your doctor.
After a positive test result, you may continue to test positive for some time. Some tests, especially PCR tests, may continue to show a positive result for up to 90 days.
If one is positive and the other negative, the answer will be negative.
Sometimes results are changing from positive to negative and then back to positive again. This is well described in other hospitals. This does not mean that patients are being re-infected or that they are able to transmit the virus beyond the two weeks after first acquiring the infection.
It's possible your viral load was not high enough the first time around. (This is also the guidance suggested by the U.S. Food and Drug Administration.) If the repeat test is still negative, and it's important for you to find out whether you have Covid-19, you could go take a PCR test.