hey am 19 years old i been on this pill 3 years at first it done...

hey am 19 years old i been on this pill 3 years at first it done good took my periods from heavy to light and down to 3 days now. for the last 7 months they have been heavy again and this month i been on my period 2 times the first period lasted 6 days and now am on it again and its already been six days and doesn't seem like it wants to stop any time soon . and oh i been having the worst cramps ever! worse then when i first got on them and ALSO.! MY period comes after the brown pills. it starts on the last brown pill and goes on the white pills has anyone ever had that ?