Too much sex?

My partner and I have an unusual relationship. We have a kind of long distance relationship while he finished writing his thesis where we see each other just about ever other month. The month or two that we are together, we usually have a lot of sex. I mean, everyday sometimes multiple times a day. And I love it. But sometimes I feel like it’s a lot for my body to take and I have felt maybe like slight pain in my uterus at random, like short sharp pangs of pain. I went to a doctor and got a scan but everything seemed normal. Has anyone else experienced this? Any tips?