Odd sting like feeling near belly

Iesha • 26
Im 17w 4d & i keep getting this feeling below my belly button.  Like a stinging of sorts but only in spurts & only when im on my back or laying on my back elevated.  Could this be the baby pushing up on the wall but not necessarily kicking or is it just growing pain?? I know for a fact ive been getting the round ligament crap & this isnt it