Only because my movements have never changed do I know where thigns are. Head down, butt right above my belly button, feet in my right side. I get hiccups way down low too, so I can pretty much tell she's still head down.
When her butt pushes out, it's a big round lump, when it's her knees or feet, its small and much more distinct... once there was an actual triangle sticking up out of my belly!!