my belly just made a loud pumping sound like you put air in the tire then my belly got really hard! : and it still hard .
Im not sure, could it of been a gas bubble or something. If you are that worried I would call your doc. How far along are you?
Definitely call the hospital and ask. Can never be too safe. I have never heard of the sound.. it really sounds like gas but please call and make sure and keep us posted!