I was able to tell with DS pretty easily by now. With this one, s/he has been in the same position for days, but I can't figure out/envision exactly what that position is. I'm thinking possibly transverse. Legs/feet are definitely to my right, but they're not high up, and I hardly feel anything on my left.
Anyway, I was really good at this game with DS (and we had it confirmed with u/s several times).
If you go to spinningbabies.com, they have a "belly mapping" program. you can use the tips on the site. It's basically where you feel hardest kicks/movement (that'd be the feet), where you last heard the heartbeat (that'd be the abdomen), and where you feel a hard mass (butt).
I think I was about 30 weeks when I was really able to say exactly how DS was positioned.
B, happily married to M. Mother to two boys: B (3/08) and A (9/10)