So I've had this birth control for about a year. Got it in April 2015. I was doing fine with it no period and such until August/September of last year and I started getting periods that lasted a month. So I'd be on my period for a month and then off for a month. My doctor had me also taking pills for a couple months and things were normal. But this past one has been longer then a month. I just want some input. Has anyone else had this problem? Is it normal? Or should I be concerned and go to my doctor?