I’m sorry that this is so horribly explained. My back got really stiff earlier and as soon as it stopped being stiff there was this shooting pain down into my butt region then my whole stomach starting tightening up and I had this burning stabbing pain in the top of my uterus. I took a warm shower and it’s still tightening and painful every 12 minutes for like a minute to a minute and a half The only reason I didn’t think much of it is because it’s only painful in the top part of my uterus. I’m 35 weeks. Between these tightening my uterus is burning at the top.