I think they are pretty sure re breech vs normal position. I think that if there were any doubt at all they would send you for a scan.

It is harder to feel anterior vs posterior. And it iss a bit harder anterior/posterior if you have lots of fat layers (not your case) or if you have really tight abdominal muscles (working out lots lately?) or if you have lots of waters.

Try to to worry and talk to your OB next time you see him. Baby will come when she is good and ready.