I almost faced this. At 34 weeks bub was breech, and they told me that if he was still breech at my next appointment (yesterday at about 36 weeks), that we would talk about doing ECV at about 37 weeks. An ECV is where they manually, from the outside, turn bub around. If this didn't work there was talk of an elective c/s. A lot of hospitals go straight for a c/s with a breech baby, cause it's easier and safer for mum and bub.
By 36 weeks, midwives and doctors like bub to be head down, but this doesn't necessarily mean that bub won't turn. My midwife said that a lot of the time, a woman will go in for an ECV and bub will have turned. It's all just precaution.

Sorry to have babbled on - hope this helps.