Sure, but why blood?: If a woman has her normal, regular periods, those periods confirm she is not pregnant (no testing is needed). If she is not having normal, regular periods, just do a urine pregnancy test. Done correctly, a negative urine test will confirm non-pregnancy 3 weeks after sex. Urine tests are cheap and sold everywhere, so a woman can repeat the test one time, if worried.
Answered 1/2/2015
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