Hey, I'm 4 1/2 mo pregnant w/ my second child and I believe I'm having muscle spasms too, in my adbomen by what i'm hearing from the other lady. I ask my doctor was it my organs moving or my muscle doing something new I never felt, she said it could be my muscle jumping but since it's not a bad pain there is nothing to worry about. It feels weird like when I turn and bend over to pick up anything, something will move but it doesn't last long just for a second or so. It started a couple of weeks ago on one side of my adbomen now its on the other side and i know its not the baby b/c I feel the popcorn feel in the bottom of my stomach and plus he/she is not that big yet to be felt in my upper adbomen. The feel doesn't happen ever time I bend over but sometimes when I"m sitting or standing. Today was the first time I felt the after pain for like 20-30min, it doesn't hurt it just don't feel right. Does anyone Know what I am explaining or can better explain what is going on, is it anything to worry about?