I have movement in my stomach, feels like a baby kicking even from the outside I am a 27 year old female, I have a rolling sensation in my lower abdomin. I do not have any pain. I ve had 2 kids and it resembles a baby moving. I took 3 pregnancy test, all negative. There is no pain, no extra gas. I m only on birthcontrol (Nuvaring), no other medications. What could it be?