Blood during sex

So sometimes when my SO and I finish having sex I see a little blood on the condom and I know for a fact it's not spotting or my period so it has to be from the sex. Is it okay? It happens pretty often and it's pretty rough I feel like he hits my cervix every time but I don't really know what to do about it, someone told me that going to a doctor wouldn't do anything as treatment or medication won't change the shape of my uterus. What do I do?