Been coughing (more casual than serious) w/ phlegm for 2 wks, no other sign of flu. didn't take any medicine, thought it'd go away, what to do now?

See a doctor: If you continue coughing without any other symptoms might wait until after 4 wks have passed since conditions like mycoplasma can produce prolonged coughing. If, however, you have fever, chest pain, headaches, blood in sputum, or anything else persisently, would see a doctor and have history and physical done to ensure nothing serious going on.