Usually 12-14 days is recommended but some women get positives from 9 days past to even 14-18 days past sex. Two weeks past unprotected sex is usually safe for an accurate result but it could definitely take longer.
Most pregnancy test boxes say to take a test 19 days after sex for a more accurate result if you do not know when your period is due. If you know when your period is due and you had sex about 2 weeks before your period is due then you stand a greatest chance of conceiving and can test when your period is due or late.
you should wait till one day past af is suppose to show or you will not get an accurate answer