Don't think I ever did! Had my membranes stripped at 41W4D. A little, tiny bit of spotting of blood came after that, but only some spotting - nothing that seemed like a "mucous plug." I hadn't had anything before that which may have been the plug.
Labor started 2 hours later, had him about 6 hours after that. Water didn't break until I started pushing & with that first push, there was only a little release of clear fluid. Still never saw any plug.