Honestly honey - try not to stress asbout it. My first was head down from 28 weeks, I went into early labour (which was stopped) at 32 weeks and went 2 weeks over and got induced!
Vy was head down form the same time and I had her at 37 weeks via emergency c/s and my waters broke as I was put on the operating table.
This baby is head down already to and engaged.....here's to a fantastic christmas i say - Babies come when they want....good luck