Spitting up Green mucus in morning

For the past couple days, my throat has had a "full" feeling, not hurting but just feels like I can't get enough water. In the morning I have been spitting up green mucus. I don't have a cough, just stuffy nose only in the morning for a few hours and than it clears up once I go to work. Then I get home and after a while, it starts again🤔 Wonder if I need a humidifier? But would that have anything to do with the geeen mucus?? I'm only 5 weeks and DO NOT want to be on any antibiotics no matter if they claim it's safe!