so me and my bf kinda sorta had sex on saturday. ever since the next day or so i had lower stomach pains which then made my back hurt like hell. my nipples are very sore, but the area around my nipples are the same color to my nipples. my period is about 2 or 3 days late. today i didnt eat to much, but i think i have been going to the bathroom quickly. im half convinced that im pregnant. i've asked so many people if it was possible to get pregnant the way it happened to me, they say no. read my posts to tell me what you think. are these pregnancy signs or am i just mentally convincing myself that i might be?