It is indeed possible to have a negative pregnancy test, yet still be pregnant. In fact, false negatives on pregnancy tests, while not necessarily common, are definitely not unheard of. Most of the time, the margin of error on a pregnancy test relies on having a negative pregnancy test and still being pregnant. This means that, if a given pregnancy test is 97% accurate, there is virtually a 3% chance that you can have a negative pregnancy test and still be pregnant. Getting a false positive on a pregnancy test, while it does happen, is much less likely than having a negative pregnancy test and still be pregnant.
The most common reason that you might have a negative pregnancy test and still be pregnant is that you have taken the test too early. The fact of the matter is that, even after conception occurs, it takes some time before your body is producing and putting out enough hCG (Human Chorionic Gonadotropin) that it can be detected by a home pregnancy test. Your body needs to be able to have the time it needs to produce that hCG for a pregnancy test to be positive. Having said that, there are pregnancy tests that are more sensitive than others. If you have been trying to conceive, for example, and are very anxious to find out at the earliest possible time whether or not you are pregnant, one of the more sensitive tests might suit you better than one of the less sensitive pregnancy tests.
Another possibility for having a negative pregnancy test and still being pregnant is an error in how you use the test. If, for example, the test does not get fully into the urine stream, or was not dipped well, it would be possible that the test could give you a negative result and you could still be pregnant. For this reason, it is important to follow the instructions on the pregnancy test, to avoid this sort of error.
Finally, if you miss the reaction time indicated by the pregnancy test, it is possible to have a negative pregnancy test and still be pregnant. If the test sits longer than the instructions indicate, for example, it could invalidate the test. While most brands of pregnancy tests won’t change much, it is important to keep within the recommended reaction time in order to get the most accurate results possible.
If you have a negative pregnancy test and believe you may still be pregnant, you should wait a few days to a week and then test again. If you receive different results from different pregnancy tests, you should ask your health care provider to give you a blood test to determine if you are pregnant.
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