Improper use of pregnancy tests, failure of pregnancy tests, shorter pregnancy time, etc. may appear pregnant but the pregnancy test can not be detected.
1. Improper use of pregnancy tests: If the pregnancy test is used irregularly, the pregnancy test may be negative, in which case it is recommended to retest according to the instructions for use.
2. Failure of the pregnancy test stick: If the pregnancy test stick itself fails, there may also be false negatives, and you need to take a blood test to make a clear judgment.
3. Pregnancy time is relatively short: If a woman is pregnant for a relatively short period of time, the fertilized egg has not yet successfully implanted, HCG has not yet been secreted in the case, the pregnancy test stick test will appear negative pregnancy, it is recommended to test for a few days in a row, or directly draw blood HCG, the diagnosis of a more standard.
Women who are in need of pregnancy can check if they are pregnant by taking a blood test about half a month after intercourse.