Having sex while pregnant and feeling

Ok every time my husband and I have sex lately I keep feeling this spasm on one side of my uterus. Is this normal? I have never had this happen before. It’s creeping me out. I’m to embarrassed to ask my doctors about.

It only happens when we have second or if I master bate.

THe spasums don’t last long but it’s still freaky. It the moment it does hurt.