Never ending Break through bleeding

Cv

So this summer I worked at a summer camp, and because we had to go in water every single day I didn’t want to deal with my period. I skipped the sugar pills of my pill pack for June, July and August. However I am experiencing break through bleeding, and this is day 11. My period is not due for another week and a half. Which means that by the time that its over I will have been bleeding for a little more than 3 weeks. Should I be concerned about bleeding this much? And is there any way to make it stop?