Thick milky discharge?

Jennifer
I'm 37w4 days. Have been 1-2 cm dilated for three weeks (as of last Friday). Started taking epro 4 days ago and drinking raspberry leaf tea (and doing the deed about 3x a week). Today I had a noticable amount of thick milky white discharge....similar to semen (sorry for the description). Anyone have this?  Is it discharge or mucou plug?