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)
Great news! I've been having contractions since Monday (discovered during monitoring for fetal movements, couldn't feel them otherwise), and every time I go to the loo now I'm wiping away globs of gloop. It's green rather than pinkish, but I'm hopeful that will come at some point.