am i preggers?

okay so i had sex on the 15th of august and apparently it was my second day of ovulation, we used condoms and i don’t think he came either. my period is now 15 days late but i took a pregnancy test and it said it was negative. i’m having stomach cramps, my boobs are sore and i have cravings… all stuff that i usually get before my period. after i became sexually active my period has been kind of irregular but it’s been 10 days late at most..not 15 days. what do i do now?