Mucus plug??

In the last couple of weeks I’ve had lots and lots of discharge. And 3 times in the last week I’ve wiped out a big mucous-y clump. Once it had a brown-ish tinge and the other two times it was green-ish. I’m pretty positive that this is my mucus plug coming out, but I’m hearing mixed things about whether or not this means I’m close to labour...

It hasn’t just been a few little bits here and there. It’s been three large (quarter size) chunks (sorry for the mental picture). Could I still be weeks away from labour? I’m 36w and a FTM. Baby is sitting super low, been having diarrhea for the last 3 days and period-like cramps and mild lower back aches on and off.