Is this normal? I've heard two definate "pops" in my uterus today. Both have happend when I'm sitting and baby moves around. It isn't loud and I'm not having any leaking or anything. Just a muffled pop sound. It has happened twice today. I've never noticed it before. I thought I had seen someone post something about that back when I first joined 3rd Tri, but thought I'd double check. Anyone else hearing pops?