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A qualitative hCG test: This test confirms if the blood contains hCG and indicates if you are pregnant or not. Doctors use it to confirm pregnancy 10 days after missing your period or earlier. This partly answers your question how many days after missed period pregnancy test is positive. A quantitative hCG test: This test gives the accurate amount of hCG in a woman's blood including very little amounts.
The test is performed too early. A blood pregnancy test can only detect hCG in the blood at around seven days post-conception. If a pregnancy test is done before that seven days is up, the test might not be able to detect the hCG yet. This can cause a negative result when a woman is really pregnant. Too high hCG levels. Sometimes, a woman will have extremely high levels of hCG in her blood when she is not actually pregnant.