Please help !!

I’m 36 weeks pregnant, I’ve had 5 pads soaked now of this green discharge (picture below)which at first I thought was my plug but there’s so much of it??? And it soaks right into the pad. I’ve been having contractions quite regularly for the past 2 days also and am not sure if they are Braxton Hicks or if they could be true labour?? Also a persistent back ache in my lower back that will not go, my midwife said to me today that she thinks I will have my baby in the next couple days and definitely thinks I won’t last a week