my last period was july 3 until july 6th. i had unprotected sex july 31 & he wasnt sure if he cummed inside of me, so we waited 3 weeks & i took a pregnancy test on august 21, and it said no, but i still havent gotten my period, i have no symptoms & i get this feeling that im getting my period now cause im starting to break out & get a discharge that i usually get when im about to have my period. help ?