Ways to make periods less heavy/ regular?

I'm 14 and I've had my period since May this year and the first couple were great, light, and then the started to get heavier.. I know a lot of people say to go on the pill but honestly I'm gonna forget to take them cause I'm not good with 'routines'. But my period started yesterday and it had been heavier than usual.. I've got school tomorrow and I don't really want to go because I don't want there to be any leakage... Please help! Thanks!!