Why Has My Discharge Changed?

I have been getting discharge for about 6 months now. I've never had my period, but the discharge has changed color a little and smells different (sort like fish). Is it bad?
– Aidah*

It’s normal for girls to have some clear or whitish vaginal discharge. It’s also normal for it to have a slight odor (but not an unpleasant one). But if there is a change in the way the discharge looks or smells, it’s best to see a doctor.

The doctor can check you and let you know if the discharge is normal or caused by an infection. Even girls who haven’t started their periods and have never had sex can still get some types infections, like a yeast infection or bacterial vaginosis. And girls who are having sex can get STDs. If STDs aren't treated, they can cause problems later in life, like infertility (the inability to have children). 

Antibiotics can treat most vaginal infections. So be sure to see your doctor and get checked out.

*Names have been changed to protect user privacy.