Pee pain after sex!?

This one time, I was having sex with an ex of mine. After I got home, I went to the restroom to pee, and it stung SO freaking bad! That's the only time that has ever happened? Why do you think that happened? We were a little rough, but not really. If time has somethjng to do with it, we had sex for like 2 hours maybe with one quick like 2 minute break. Can someone help me? I don't know if I'm the only one who has experienced this!