Few things to share on this topic...
My DBro was breech (this was in the time before ultrasounds, so I think it was a surprise). My mum is teeny and DBro was a huge baby, upwards of 10lbs and it was all ok. Extremely anecdotal of course!
DD1 was a bit early but my waters had broken and labour was not established, so they were inducing me. The consultant rocked up and took one look at me and said "Has anyone confirmed the presentation of your baby?" I had had my 32 week scan where she was still head-up, and this was 37 weeks or so, so I had not had another scan. Well, they rolled a scan machine over and sure enough determined she was still indeed breech.
I have honestly never seen people move so fast in my life to get me off the drip! I think the word "STAT" was even shouted, which I thought only happened on TV. Bit scary.
Turns out it is very dangerous to induce a breech baby, mostly for the baby (leg and cord issues) but for the mother as well (risk of tearing etc).
They gave me a choice of waiting for labour to start naturally, but there was a risk of infection of course because my waters had broken 48 hours previously. And oh, by the way, "Nobody on staff has ever delivered a breech birth vaginally!" 
As soon as I heard that, I signed right up for the cesarean they offered me.
Sorry, that was way longer than I intended! I guess what I want to say to you, OP, is to consider what you would like to have happen if you go overdue and the baby is still breech. How long would your consultant be willing to wait? How do you feel about an "elective" cesarean? Also check whether I'm right about the not inducing a breech baby thing - I could be wrong (it was a bit of a haze and also 9 years ago!)
Good luck 