I don't have a HUGE bump to begin with, though it's noticeable when I'm standing. When I lay down however, it's a grand disappearing act. My lower belly is harder, but it's relatively flat. When he moves though, my belly moves and you can see it get poked and prodded, so that's reassuring.
Also happens when I lean back in my work chair (like right now). I hate it because I feel like my stomach has shrunk. I'm carrying really low, which may have something to do with it.