Okay, so i'm 17 almost 18. i haven't been on BC in a few months, over 6 months. i have a regular period. i had sex while i was ovulating.. well according to the rule of two weeks after your first day. i checked online after having unprotected sex if i was, and i was. so anyway. that was last week, on friday. i just started having camps like pms but nothing as painful or no spotting. my upper ribs on my right side hurt, well they're tender. also, i'm anemic and i do take iron vitamins. i've been getting headaches and lightheadness a little more. also, the day after i had sex i had blacked out in the shower.. my mother said it sounded like a seizure. my lower back hurts too. could i be pregnant or just stressed, sick or something else?? i don't get my period til a week from now, but i'm worried alittle now? what's the changes of be pregnant? is it too soon to know just by my body??