I lost my virginity a week ago , my boyfriend did not use a condom the first time , he pulled out , the second time however he did use a condom , i experienced lots of genital pain during my sexual experience , however this whole week i've been experiencing stomach aches , head aches , food cravings, - its only been a week but i'm starting to think i am pregnant ,i am not late yet on my period though. can you please explain what is going on.