Health Question!?

Hi, I have had a bad cold for the past month. Got it from my 2 year old nephew! Anyways, it started with stuffy nose and a huge head cold, a couple of weeks ago it went down to my chest and throat. Now I am having huge coughing fits (I cough and cough. Can't catch my breath and it's hard to relieve coughing. even with a drink or cough lozenges). Anyways, yesterday I started bringing up clear phlegm. I know my chest is just trying to get rid of it. But ... what color of phlegm is a bad color to have (like pneumonia).