you should wait till one day past af is suppose to show or you will not get an accurate answer
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.
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.