The wording in your post is confusing and question vague. Pregnancy has been documented from exposure on any day of the cycle including during menses. Tests are likely truly negative by 3 weeks after exposure but can be falsely negative early in pregnancy. From this story you might be pregnant, and the father may be either man.
Answered 2/9/2023
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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 2/13/2023
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