Im 30 weeks and...

Justine • Married. Two kids Jaxtin 5 & Jovi 4 and expecting baby girl Jayah near the end of April.
I'm 30 weeks and have been feeling cramping only in my vag. (Sorry for tmi) bit not my sides or back or anything. My Dr won't check for dilatation sooo idk what it is but it's intense when it happens. Does anyone have any insight on this?