Am I pregnant?

So my boyfriend and I had sex the 21, 22, and the 23 of March. Those are all days I was fertile. But he never came. One night we were drunk so he might have and not known. He also precums ALOT. I was supposed to start my period the 8th of April. It is now a week and I still haven't gotten my period. My breasts hurt but my napples aren't dark. I have lower cramps. I have head aches. And I've been feeling sick like almost nauseous. I'm so confused on what this is.