Red stuff?

I'm the same age as you and I don't want to bother you but... your on your period. It's brown at first then it turns red. Sorry but yeah, thats the truth.

It's called a period, which is a way that you body gets rid of excess fluids that aren't needed right now. I started mine when I was 11, and you usually start when you're a pre-teen or a teen. Every girl has theirs one time or another, so you're not alone. If it happens again, don't worry it's completly natural.
Hope this helps. :)

Period