Pregnant?

I wouldn't say I'm stressing but I'm a little worried about if I'm pregnant or not. I had sex unprotected for the first time the day after my period. It lasted a maybe 10 minutes that's it and he didn't cum in me. That's was on Valentine's Day. I was supposed to start my period three days ago and normally I'm a few days late but idk I'm just a little scared and should have been more careful. I've had all the signs of starting my period soon like the tender Brest, the acne, and mood swings. I also get light cramps which is a little weird because when I'm about to start my period I get strong and uncomfortable cramps. Why do you guys think? I'm not nauseous at all, I'm not gaining weight,or having strange cravings