cramping after sex (?)

Sarah • 17 years old, a lil scared
hi, I'm 17 and I've only been sexually active for about two months now but usually after sex I have some lower abdominal cramping? It's not severe but it is definitely noticeable. I googled it and it comes up with a couple of things but none seem applicable to me. does anyone have any ideas? also, should I bring this up to my boyfriend?