currently my underwear has white/a little bit of brownish discharge in it

Okay so totally normal. Having some discharge in your underwear is a super common thing that happens, especially when you're growing up and getting closer to your first period.

White discharge is usually just your body cleaning itself out. It's like a natural lotion keeping things healthy down there. Brownish discharge can mean a few things, but it's also usually nothing to worry about. Sometimes it's just a tiny bit of old blood mixing in, maybe from irritation or sometimes it's a sign your period is coming soon. Your body is basically just getting ready.

If it starts to itch or burn, or smells really strong and bad, then it's a good idea to tell a grown-up just to make sure everything's okay. But usually, this kind of discharge is just your body doing its thing.