Burning menstrual like pain

🐘🐘🐘 • 👧🏼 born 1/19/16. 👼🏼 lost 9/15/17. 👼🏼 lost 11/26/17.
Right under my bump like where uterus usually would be pre pregnancy, it burns like a bad period. I'll be 37 weeks in a few hours. Is anyone else experiencing anything like this??