Help: CRAMPING during or after sex!

jasmine

Me and my bf have sex at least 3-4x’s a week depending on how many days I see him. Usually when he penetrates me hard or deep I sometimes get extremely painful cramps in my uterus’s area can anyone help me and explain why???? I’ve seen a gynecologist for this and they say it’s nothing and that my muscle’s just constricting but this has never happened before with anyone else.