I'm almost positive I'm losing my mucous plug. I'm 37 weeks on thursday. How soon does that mean l will go into labor?

Soon...maybe. Usually within 2 days is what we're taught... After doing this for over 20 years, I've learned that the wait can be much longer. If it's truly a mucous plug from cervical change & with increasing contractions; you may deliver within the week. But, remember, your baby hasn't read the same books & will come when it's ready! ;).