Pain after orgasm??

👑M

Okay so I an 35w5d along and my partner and I dont really have sex as much because it's just uncomfortable to me. The last time we had sex, everything was fine during, no discomfort or pain, however after I orgasmed I had a lot of sharp cramping pain. And I've noticed that even if I masturbate now since sex is so fleeting.. I still have the same sharp cramping pain in my lower stomach.

Does anyone have any idea what that is??