BH? Something else?

Super weird question... 35w4d, FTM. I have no idea what BH or contractions feel like. I read about them, and how your stomach is supposed to kinda harden and it feels like period cramps. I never really got cramps so I'm not sure what I should be feeling, and my tummy doesnt harden either. But I've had pain radiate down toward my vagina that usually lasts no more than 15 seconds, that's happened a few nights in a row now. And then I also have pain toward my butt as well... what are these signs/symptoms of?