Suggestions please

Tori

So, I'm new to this whole thing. My boyfriend and I, had sex on the 7th, he didn't finish sorry if that's too much TMI, my period was only 3 days it's normally 4, so after that, we ended up havin sex on the 29th, and since then I've been crampy, bloaty and gassy. I'm not sure why. I believe I'm CD 16