If a pregnancy test 14 days past SEX* says negative, can it be trusted as accurate?

Question

pregnancy test 14 days past SEX* says negative, can it be trusted as accurate?" /> 
*calculating days past sex, not ovulation because I rarely have a cycle. Quite irregular.

Answer

For the most part, yes. However, it’s definitive after 21 days

If a pregnancy test 14 days past SEX* says negative, can it be trusted as accurate?

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