Lost mucous plug at 37 weeks

Samantha • We are expecting baby girl #2 on 10/31! Can't believe the changes coming!I work full time as a Vet Tech and live in Maine.
So this morning I lost my mucous plug. I'm 37 weeks exactly and have been having on and off contractions the past week in a half. I have also been measuring 2 weeks ahead the entire pregnancy so I'm measuring at 39 today at my apt. How long did you guys go after loosing your plug?