What Causes Dizziness And Tender Breasts Before A Period?

Yes I was wondering if I should worry about being pregnant. I had unprotected sex 2-3 weeks ago, he pulled out but we were drunk so i'm worried he didn't pull out in time. Anyway, I'm due for my period in about a week. Last week I was really tired and moody, I have been hungry alot, troubles falling asleep, shortness of breath at night, dizzy when I stand up, stomach and breasts kind of bloated. Is it pms or should I be worried about pregnancy?