Weird jerk feeling in uterus?

At first I thought it was gas but it's right over my pubic bone and it happened again it felt like a jerking tugging movement and it was really fast and harsh like it hurt and it was the weirdest feeling I have ever felt. I am really in tune with my body and I have endemetriosis. 
I'm not pregnant I just got off of a full blown 8 day period last Wednesday. After that I feel a weird crampy pain and I still feel it. Could something have burst? Would I bleed if something did? 

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