Yeah I have been on bed rest since 29 weeks. Because of preterm labor.. I had an apt today. The doctor said my cervix was ripe. 4 cms and 50% efaced. And now I have lost my plug ... so I don't know ...
I don't have any knowledge of losing it with my first. It happened, I'm sure haha, but I don't know when. As far as I know there isn't any "rule" for how long it'll be until labor starts. Hopefully yours doesn't yet, cause baby isn't full term.
I lost mine when i was in labour...all 3 times!! Good luck.