what can I do to regulate my period?

I am on the bar, and have had a period every other month, for ocer a year and a half.But in April-May, I had 2 periods, only 2 weeks apart, both lasting 2 weeks or more. Less than 2 weeks ago, I got off of my 2 weeks long period, and now I am either spotting, or I'm starting my period. What can help regulate my period? I loved the every other month periods, but I don't want these abnormally long and frequent periods to be a normal thing...