Could anyone explain my problem?

Bambi • A sound soul dwells within a sound mind, and a sound body.
So last night I had sex and it was a little painful. Kind of like a pressure type of pain. And when we were done the REAL pain hit. It's the worst cramping pain I've ever felt in my life. I was doubled over in pain crying do hours until a room a scorching bath and then finally fell asleep. I'm still feeling remnants of the pain today. I've taken laxatives and midol to see if either of those helps. I just want to know what it might be?