From what I've been told - the mucous plug can pretty much regenerate (as it *IS* mucous !).
I lost a large chunk of mine, if not the whole thing, 1 day shy of 4 weeks before my son was born. Just showed me that my body was revving up for the end. I was worried, it was my first baby, and I didn't know what it meant, but my midwife and doula were both very quick to ease my fears.
Canadian mom to Boo (Aug '02), Bug (Aug '04) and Bear (Dec '06).
Jesse (July '09)