I was having sex with my boyfriend, he was on top, I got on top and started getting really bad cramps. What is going on??

Hi,belle, how old are? I think you should learn some video from youtube.com or blogtv.com and then try again:)

It could be because his penis is hitting your cervix.

Was there any discomfort during sex while he was on top?

Was this your first time? Where you wet enough for intercourse?

A lot of different things could be going on here. A female's body is complicated. Usually, when there is pain, that's your bodies way of saying, STOP!

Where is exactly is the cramping?
In your stomach? Or elsewhere?
I get shocking cramps in my legs when I'm on top... usually right at the point of climax... grrrrrrrrr