I felt my baby flip from breach to head down at about 30 wks. I could see bumps sliding past under my skin. : ) I didn't feel the baby flip back to breech at 33 wks, though, but I did feel the baby was sideways at 32, so I wasn't too surprised to find at my mw visit baby was breech again at 33 weeks.
Movement can be helpful, but I have trouble visualizing position from that. Also, the first time baby was breech I had kicks on my ribs, but it was because baby had feet up by the head!
There was a thread somewhere around here recently about feeling the difference between head and bottom... I think the consensus was that if you gently wiggle/push the head, only that moves, but if you gently wiggle/push the bottom, the whole baby moves. I still have trouble feeling the difference, but that is how my mw tells position, and then confirms it with heart tones.
Christian wife, busy happy mama to 6yo DS, 5yo DD, 3yo DS, and 1yo Ruby! ICAN leader, tweeter, nerd.