What Causes Long Periods With Heavy Bleeding?

Hi, may I answer your health queries right now ? Please type your query here...hi, there my name is jessica and i just have a few questions to ask. i started my period 1 week early and i usually only have it 4 to 5 days max and its been over a week that i have had it and its not light! I do have Ovarian Cysts from what i was told and i just started to get my period back like 4 months ago. What could this be i am on Evra