Mucus Plug?

As I was taking a shower at 3 this morning I felt something run down my leg and when I looked it was a big blob a little bigger then the size of a quarter of this jelly like stuff (not my normal discharge, I grabbed what I could to take a picture then layed down and went to sleep, just got up its 9am and I went to the restroom and wiped and was more of the same jelly like stuff. I'm exactly 37 weeks today and wondering is this my plug? Will it grow back or what? Anyone else loose they're plug at 37 weeks and end up going into labor?