Hi smudgie

I was fully dilated (10cm) and my waters broke then. I wasnt allowed to push yet (due to being in a ambulance and only 30 minutes from the hospital).
So yes wouldnt bet on your waters breaking as a sign as a lot of womens dont actually berak and need to be broken for them!

As for establised Labour (4cm onwards ) it was about 4 hours b4 my waters broke and bub was delivered 30minutes after