Pain around the pelvic bone

So yesterday I got pretty bad cramps, it was like my pelvic bone was hurting and also felt like strong menstrual cramps. They were long and painful, but not unbearable. Didn't feel like contractions at all (it didn't come in waves, it started hurting and it stayed hurting for a while), just sudden pain. Whatever it was I'm thinking it's okay to feel pain as long as you're not bleeding, having a fever or the pain is unbearable, right? I know my baby is really far down (I'm 36 weeks) so I'm thinking maybe the baby was hitting something that made it hurt?