*GIRLS ONLY* When I sit down for a while when im on my period i have to go to the washroom?

When i have my period and im sitting down in cl and its recess i get up and i can hardly move because i feel like i have to go to the washroom and i cant hold it in. is there anyway to stop this from happening? i ate like 3 bananas once and it kinda helped is there anything else that doesnt require taking pills or meds?