Last month 09-30-12, i had sex around ovulation time (unintentionally). I didnt think anything of it until i started vomiting 8 days later and didnt stop until a week later. The vomiting stopped but the nausea stayed. I also had/have other symptoms such as tender BIGGER breast (they hurt so bad), back pains, fluttering, gas, stomachache and even a linea nigra!! Im not sure if i was already pregnant or i just gotten pregnant but i know my body! My last period 10-15-12 was light with no cramps which is absolutely abnormal for me because i usually have to take 3 tylenols a day when im on my cycle!! This month I am going on 3 days late for my period and my belly is changing shape and all but took 4 pt two weeks ago that were bfn!! Has this ever happened to anyone else?