I'm not sure about having to deliver early but, my friend just had her baby last week and he was breech for 5 weeks then suddenly turned.
She was doing yoga stretches and things to encourage him to move. If your dr know any and doesn't have an midwife (not licensed laboring nurse) but an honest to goodness midwife try calling some midwives in your area for stretches to try.
Lots of times they will help with basic advise even if you aren't their patient because they are pro natural birth and want to see your baby turn.