How do I feel comfortable walking around when I’m on my period?

Whenever I’m on my period, I hate getting up and walking anywhere. At home, I hold my hand under my pants and press up so my pad will catch any blood when I move. But now, school started, and I can’t do that. I’m so scared since I know that my period is going to start either tomorrow or really soon. This is my first time that I’m going to have my period while school is going on. On my third period, when I woke up, I got up, and blood instantly gushed down my leg. That only increased my fear of walking when I’m bleeding. Is there anyway to control that bleeding when I’m walking, or at least for comfortable so I’m not constantly having an anxiety attack whenever I need to get up and move around? There’s even more walking now that school started, and I feel so unprepared.