Sometimes,This is genetic.Your period is heavy
like mine,As my mom told me,Periods
are normal.I had the same exact problem,You might need to tell your teacher it's a SUPER EMERGENCY! Or you need to go to the bathroom at lunch or during before or after school.Also wear the Serenity TENA Pads,(The ultimate kind if it's that heavy!).Sometimes,A diaper might help,I know it's a poor choice but pads are so Expensive these days,The best you can afford is a big diaper.