Baby turning

Natasha
Hey guys, 
I have a question. I'm very late in pregnancy (almost 40 weeks, FTM so I know she'll probably be late) and my baby hasn't turned yet. I know the chances are slimming that it'll happen but I also know it's not impossible. 
If your baby turned late, did they do it all at once or did they slowly sink into the position?
Thanks, I appreciate anything you have to offer.