Quoting Emily M Smith:" When mine broke with my daughter I was sleeping and got a little wet I thought I just peed so got up ... [snip!] ... and they told me to come in..it turned out to be my water but never started labor on my own...I would call ...good luck mam"
Oh yeah, I'd like to add that I suffered through weeks of pre-term labor & only dilated to four despite having contractions 2 minutes apart. I still ended up having to be induced even after my water broke to make my contractions come on strong enough to dilate me. So water breaking doesn't always bring on labor.