Females don't commonly have urethral discharge. If they do, and it's not an infection, it should be clear and sort of mucousy.
If that, or vaginal discharge, ever changes, has a yellow or green color, has an odor, is accompanied by pain, burning, itching, increased urination (frequency and urgency), then it's time to see a doctor.
If you are concerned about your body, make an appt with a doctor and find out if what you are seeing is normal for you.