am i pregnant

i had unprotected sex on aug. 6th, he pulled out. i started my period on the 11th, bled heavy, cramped like normal, so of course i was like HELL YEAH. i’m suppose to be having my next period on the 12th. but my boobs feel fuller/heavier, & my nipples seem puffy. i’ve been feeling kind of bloated, like gas in moving in my abdomen.. like what the fuck is going on. am i just pmsing like a motherfucker?? is it possible my hormones just going crazy cause i’ve reached a new age?.. like i’m about to be 21.. so i’m hoping of course that im just being crazy and i’m not pregnant. and if i was pregnant wouldn’t my period of been stopped??