me & my boyfriend had sex on the 7th which was a Friday, we were drunk so we didn't use a condom & he came inside me. I got my period on the 14th, could I be pregnant ? when I woke up on the 14th I had a sharp pain in my lower stomach were my overies are at. my period only lasted one day but it was heavy.. also I use to take birth control shots but I stopped taking that about two years ago & ever since then my period has been irregular. I will get my period for one or two days and then I won't get it again for two month or longer.