Sorry to sound a bit graphic and possibly disgusting but it's first baby and I'm unsure.
I'm 5 days from due date and when I went to the toilet an hour or so ago I had what looked like two bogies in my normal discharge. They were only a couple of centimetres long and quite greenish but a lot thicker than usual. literally looked like two snots (really sorry if tmi) 
Is this part of my mucus plug coming away?