Hi there
With N I was at 38 wks 3 days and i went to the OB. she did an internal (was going to do S&S) and found I was 3 cm dilated. said i would go sooner rather than later... he was born on the friday (this was a monday) after a 4 hr labour...
I think if you are dilated so far before you go into labour it may mean you are likely to have a quicker labour.
Good luck - cant wait to see your BA.