Labor?

Okay so this morning I think I lost a part of my mucus plug this morning. It was like a yellowish, boogery substance (not like normal discharge). I've had cramps on and off all day (not contractions) and now I've been discharging like crazy, like thick, white discharge, more than normal. I see my midwife tomorrow morning so im gonna let her know, but should I be preparing for labor soon? I'm 39 weeks and 6 days.