I was just laying down in bed and felt some pressure to one side of my belly button. When I looked down, that side was "popped" up more than the other side. When I felt it, it was hard as though something was there. I haven't experienced anything like that. What was it? Could it have been the baby's bum, head or whatever pushing up against my belly? I gently rubbed it and tried pushing it down and it eventually settled.