HELP! Pain during AND after sex??

My bf and I did it last night and I noticed it hurt at various times. Like when we first started, it hurt when he went in. I’d been in a dry spell for a few months, so I get why that would hurt, but it seemed to be more than usual. Then later on he was pounding me kinda hard and it started hurting pretty bad on my right side by the part of my pelvic bone that sticks out. Then a few hours later when I was about to go to bed it starting hurting in the same spot as well as where PMS craps are. My cramps are usually bad, but this was like next level, to the point where it even made me nauseous. Does anyone know what this could be/if I should be worried?