Deseprate For Advice Help Please!!!

My b/f and I messed around a lil over two weeks ago, and he had cum on his hands and penis but went and washed it off before he touched me. Then he fingered me, and we left and went somewhere. Then we came back and had dry sex. I know there is a very small chance of me being pregnant but im still worried about him having precum or something. My period is 3 days late today, but I think im having pms signs but im not sure. I have lite cramps, im very irritable, and a lil constipated ( sorry I know thats nasty) and I just wanna cry at random times. If anyone can tell me something or has been in this postion please tell me. Im scared confused and soo worried. I dont wanna baby to take care of in college. I definatlety have learned my lesson about being unprotected