Can rough sex do any harm?

My boyfriend goes a little too hard while being intimate and when I tell him to stop he keeps going like its a turn on for him lol.. I think he just gets too into it and caught up in the moment. I loved it before being pregnant but now it kind of worries me anyone know if that can that harm my cervix or anything? I feel he's going too deep as well.. Sorry if this is tmi or a stupid question I freak out about everything. Lol.