I've been having this issue where I'm coughing up green and yellow phlegm for the past four days. It used to be white but then turned to green and yellow. My nose feels really congested, but I don't have a fever, fatigue, or any lethargy. I went through a CECT scan of my thorax earlier and everything came back normal, no abnormalities. Usually, this starts in the early morning and lasts through the night, but it doesn't disturb my sleep. Should I be worried, or is there something specific going on that I should get checked out?

take a course of antibiotic like amoxyclav for 5 days teice a day