31 weeks, I think I just lost my mucus plug?

Lace
31 weeks today and I had a large slightly bloody/mostly thick whitish green discharge in my underwear when I woke up this morning. It was a lot. Like probably the same size as the palm of my hand. Ive been having very small amounts of clear discharge for weeks so it's definitely unusual. I think it's my mucus plug? But I thought you didn't lose that for many more weeks? My doctors office is closed today and I don't really want to go to the hospital. Is this normal? Should I go in?