Mucus plug or discharge?

Hello all I’m a ftm and I’m 37w 1d doctor said at my last appointment that baby could come at anytime and he thinks she will be early. I had a few of what I believe to be contractions the other day and have had some on and off again Braxton Hicks and Back pain. Woke up with some bad pressure that won’t go away and it feels like baby is about to fall out. Could this be a piece of mucus plug or just some discharge?