I discovered mucus plug (just a glob of mucus for me) about 20 hours before the start of contactions. 3 hours before my dd was born I had bloody (very bloody stringy mucus) in my undies. Enough to need a pad or tampon if I hadn't been pg.
My labor was 12 hours long at 40w1d, no induction, no stripping. I would think yours is more from the stripping.
DS - 5! - adopted at birth after infertility, IUI, and IVF; DD - 4! - surprise pregnancy discovered when DS was 8 months old ; Hoping for another soon (actively TTC ~ 2 years)