How long were you 3cm dilated?

Anyone else 3cm dilated already?  How long have you been or did you experience this with another baby? Doctor says he doesn't think I'll go to due date (April 9th) but I'm not sure what to expect as far as when I may go into labor. Trying for a vbac so I'm hoping she decides to come on her own. This is my second and with my first my water broke at 4cm but my membranes were stripped at 2cm.