Do I have to do PE on my period if my cramps are really bad

You totally don't have to push through PE if your cramps are making you miserable. Your body is doing a lot of work when you have your period, and sometimes you just need to rest.

It's a good idea to talk to your PE teacher and your parents about how you're feeling. They can usually help you figure out a way to take it easy without missing out completely, like doing some light stretching instead of running, or sitting out. Lots of people feel tired or have cramps when they're on their period, so this isn't anything super weird.

For really bad cramps, you can try things like a heating pad, drinking warm water, or even some over-the-counter pain medicine, but always check with a grown-up first about what's okay to take. Sometimes a little bit of gentle movement can actually help with cramps, but if it feels worse, then definitely don't do it. Listen to your body!