http://www.barrettweimaraners.com/green-discharge-in-a-pregnant-bitch/This article, one of many if you search, is how I'd view most green discharges. We even had a puppy who was 'green' when delivered. All was fine and once cleaned off, he was perfectly normal too.
If you can avoid needing a vet at this time (C-virus) do. Mine will still take in emergencies, but now had an online diagnosis set up - 15 mins in a timed slot. I needed some eye drops yesterday, phoned in and after my vet agreeing, more was made and and left on a bench outside the building for me to pick up at a given time-slot so the only person I actually saw was my vet leaving in his van. We waved. And apart from what's going on at the moment, your bitch will probably be better not taken there again, if it can be avoided.
Good luck!