There's a very unpleasant odor

Look, menstrual blood is bound to have a smell, right? It's blood, and blood has a metallic smell that's normal because it contains iron. But if the odor is very strong and unpleasant, like a different smell than what you're used to, then it's worth paying attention.

Normal discharge, which we have every day, is more whitish or transparent and doesn't have a strong smell. If the smell suddenly changes and becomes really bad, or if the color of the discharge changes to brown, gray, or green, and even more so if it's itchy or burning, then something might not be 100% right.

If this happens to you, the best thing to do is tell a trusted adult, like your mom, dad, or the person who takes care of you. That way, they can help you figure out what's going on and, if necessary, schedule a doctor's appointment to check if everything is okay.