It sounds like an infection
It does sound like an infection tell your doctor about so he can make an std test
Sounds like your mucus plug. It can come out looking like snot. Didn't mean labor is starting so you don't need to call unless you start getting contractions or pressure. Just mention at next appt that you think you lost it.
Sounds like your mucous plug. I lost mine right around that time with my first pregnancy and it looked the same way. I called the doctor and they said you can lose it at any time, it will regenerate. Unless you are having contractions, there is no need to worry
I had attended the labor class last week. The instructor said that incase you see black or green discharge rush immediately to hospital. So I think you should consult your doctor today instead of waiting for next appointment