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Perfectly normal, Before you start your period, you'll probably notice yellow or white stains inside your underwear. That's the fluid that's produced by your body to moisten and cleanse the vagina. This is natural moisture from the vagina. Some time brown discharge come out when evolution process begins in teens. It's perfectly normal and it's a sign that menstruation will probably start in about 6 to 18 months.

The discharge may be heavy or barely noticeable both are normal. However, if the discharge has a bad smell or you have any pain, soreness, or itching in the genital area, it may be a sign of infection. In this case, you should see a doctor.

If you don't like the way it feels or you want to protect your undies, try wearing a pantyliner. The pantyliner will absorb the vaginal discharge and help you feel fresh and dry.

Hope that i Answered your Question.

be sure you're not confusing discharge from an infection with cervical mucus.