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Queens, NY
A 23-year-old female asked:

Is a true false positive a reason for concern ? my tests are positive at home but negative through the blood?

1 doctor answer1 doctor weighed in
Dr. Gurmukh Singh
Pathology 50 years experience
Test for what?: If you mean pregnancy test, blood test is more reliable. Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days.
Last updated Jan 11, 2021

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