Okay, I'm gonna have to say this and I doubt very seriously it's what you have BUT have you had any pain? I only skimmed through the three pages so I may have missed something. I remember when I found out I had IBS (Irritable Bowel Syndrome), I was very bloated and could actually feel movement - turns out it was gas that wasn't coming out (I know, TMI!). BUT I also had pain with it. I actually thought it was something with my ovaries because that's where the pain seemed to be. So, anyway.... as for the movement you're feeling, I'm sincerely hoping it's a little bundle of joy in there and not gas
but that is something that popped into my head while reading your description. Good luck!!