A member asked:

Can implantation bleeding occur 21 days after intercourse i have seen lil vaginal blood not liquid (got clotted). it was negative preg test when i did it 4 days ago.(16 days after sex?

A doctor has provided 1 answer

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. Use first morning urine and follow instructions for the test carefully.

Answered 9/27/2022

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