I also lost my plug little over 24hours before my daughter was born!
It's been 8 years since my last one and I can't remember for sure.
I lost my mucus plug on may 21 and went into labor may 22 and had my son. This was in 2005. Every women is diffrent tho some go into labor next day or it could be a couple. Be ready is all I can tell you. Good luck!