Periods..

Okay so I have a question ... I have an abnormal period , & usually I have a period approximately 3 times a year. Now I haven't had a period since July last year .. I started bleeding a day after my boyfriend came home from college (no sex) on December 15th 2015 . Now my question ... I'm still bleeding as of today Jan 31st  .. That's over a month, I've never bled no more than 5 days  ... Should I be worried ? Or is it just my abnormal period?