It's lightening where I'm at so I ran to get something outta my car and ran back in the house. Right when I got in the house I started having uncomfortable pain in my uterus. No cramping, just like a sore pain. Last time I went to get an ultrasound it showed him buried in my cervix. Could that be the reason? It also does that when I walk for a long period of time. I'm 21 weeks.