Ok so my bf and I had sex on Valintines day and my period usually starts on the 14th or 15th of every month and i am now late by 3 days so the second day I should have been on my period I took 2 pregnancy tests that came out negotive however one of my co-workers said that it would be inaccurate to wait longer! So I freaked out and got a plan B just to feel better about it! But when is a good time to take a pregnancy test after you've missed ur period and everything??!!! Advice?!?