Weird pain during sex...

The other night my DH and I were having some sexy time. While I was on top I kept getting this weird pain. Nothing crazy or debilitating but it felt like pressure. That's the best way I can describe it. Does this happen to any other ladies out there. It's like DH was hitting a bubble or something. I don't really know how else to describe it. Also it is late in my cycle so perhaps my cervix is low??? Idk.