Every labor is different just like every pregnancy is. My water broke at 40 weeks. When I got to the hospital they said I was dilated to a .5 yes like half of 1 lol. It took me forever to dilate even after being put on pitocin for hours. You will do great :) its just like pooping. If you can poop you can push out a baby :)
With my second pregnacy i was dilated to a 9 before they broke my water
All of times you'll start to dialate before your water breaks.