uterus pounding?!

Okay ladies, I'm a virgin. But it feels like something's kicking around my uterus? 
I've been on birth control for 3 months now,, 
And it started on last months period. I figured it was apart of the cramps but It hasn't stopped. It doesn't hurt it just feels weird. It happens multiple times a day. 
Its nothing serious right? 😂 I want to make sure what other people think it is or if they've gone through IT before I schedule a dr. Appointment and sound crazy 😂