Don't worry I was told Little miss was back to back at the beginning of December.. I bounced on my ball a lot, stopped slouching on the sofa and the boxing day scan showed she's in a good position SO you have AGES to turn him yet..
They can be turned around right up until your are in labour - basically someone stabs you in the ass really hard with their fingers and the baby turns away from the musle reaction - ask your midwife about the correct method and how to do it.