Weird Much? Any Advice ?

my boyfriend and i tend to have A LOT of sex. Just recently (feb. 21) he accidentally nutted inside of me. Mind you, we’re 17.. and so at first we wasn’t going to keep it, but then the very next day, he nutted inside of me again. So at this point , we decided we was going to keep it.. every time we have sex he nuts inside. And it’s probably been 11 times it’s happened. This week, i felt nauseous, i ate a lot and I’ve been really moody, so we thought it was because i was pregnant (we never took a test or anything so was was never 100% sure, we was just assuming) .. i just got my period.. what does that mean ? please answer because im scared and really curious as to what’s going on with my body..