@wifeandmother, if your concerned the best thing to do is call your obgyn. it's better to call and it be nothing then to not get checked and it be something
mucous plugs can rejuvenate some people lose theirs 2 or 3 times a pregnancy as long as your not having any other signs of labor you should be fine. if your really concerned call your obgyn
If you're having any contractions I would say go to the hospital if not I would call your doctor when you can. Yes the mucus plug can regenerate but it's usually a sign of dilating. Was it bloody at all?