Need Some Help...

When I was pregnant with my second child, I would have sex with my SO and when we were done, I had a gagging reflex and I thought that maybe it was normal becuz I was pregnant with my second child and figured every pregnancy is different. Well last nite I had sex on one of my safe days, and yet again when me and my SO were done I gagged again. Is it normal to do this??? I never had this problem till my second pregnancy and now. Should I see a doctor about it???