had a 2 day period... prego or not?

Im 21 and Well i had unprotected sex almost everyday for about a week leading up to the first day of my period which was Friday 3rd of may 2013 and it lasted 2 days bleeding kinda normal on Fri then sat it started to diminish and sun it was just brown discharge. I had sex also during the time i was bleeding... Fyi my man came inside me everytime.. So sorry if that's tmi. Im always tired i sleep atleast 12 hours if i don't work, im gassy, ive also been feeling some pinching in my cervix. If anyone can give me any answers to whether i could be prego or if its not possible it would be grately appreciated. Also if you could tell me when i couldve conceived that would be great too.