Hi, I Have Been Having Issues With My Period, For

Hi, I have been having issues with my period, for the past year it has been extremely irregular even though I am on birth control. I have tried many different brands with different dosages and nothing has helped. I was getting my period every other week despite where I was in my monthly pill cycle and recently have had continued flow and spotting for the past 6 weeks. I also have an IUD (non hormonal) which I got put in during my abortion July 2015. I used the IUD as my main source of contraception from July - November 2015, until my acne got so bad and my period was full flow for entirely 6 weeks. I needed something to control it, so I started taking birth control again... bringing me to getting biweekly periods