Me and my boyfriend had sex for the first time. It was protected and I'm almost positive we did everything right.He cummed in the condom and we stopped as soon as he did. This was on 1/15/13. I usually get my period around the 16th or the 17th but today is the 24th and I still haven't gotten my period. I've been having stomach pains and sore breast. I have slight back pains and I'm paranoid that I might be pregnant. I'm 16 and I'm really scared. I want to take a test but I don't know when. Is this normal?