If you’re out and you stain your underwear but not the rest of your clothing, you can simply place some folded toilet paper over the stain or wrap it around the stain and change your pad or tampon to prevent further leaking. If your underwear is really saturated, you can wash it in the bathroom sink with some cold water and soap — this usually gets most of the blood out. Then when you get home, you can throw them in the washing machine. It’s a good idea to ask a trusted adult for help the first time this happens. The person who does the laundry in your household probably has a few tips!