At school, where should I put my dirty underwear?

Look, you don't need to worry about that! If you need to change your underwear at school and it has a little bit of blood, the best thing to do is wrap it up nicely in a piece of toilet paper or a small bag (like those for sanitary pads) and discreetly put it in your backpack. When you get home, then you can deal with it. No one needs to know, it's your private business, you know? And if it's an emergency or it got really messy, you can go straight to the bathroom and throw it away in a trash can, wrapped up so no one sees. It's super common and everyone understands that these things happen.

What if there's no paper or bag?

If you don't have anything to wrap it in, be discreet: fold the underwear in a way that the soiled part is inside and place it in a corner of your backpack or bag. As soon as you can, throw it away or keep it to wash at home. The important thing is that you feel comfortable and not embarrassed. It's normal to have to deal with this sometimes, it's part of having a girl's body.

What to carry in your backpack to avoid trouble

To avoid this hassle, the tip is to always have a small emergency kit in your backpack. It can be an extra sanitary pad, a wet wipe, and if you want, a small plastic bag. That way you're always prepared and won't be caught off guard. It's like having a plan B for anything that menstruation might throw at you at school!