Since April 2010 I have had irregular periods (the month after I went off birth control pills). I can go anywhere from 3 to 8 weeks between periods, most of them being 6 to 8 weeks apart. I've brought it up to my doctor before, but he never ran any tests or anything, just did a pelvic exam (I was going to get Mirena) and a pregnancy test. I'm starting to get worried and frustrated. Should I make another appointment to see the doctor? Or is it nothing to be worried about yet? Another question, what could possibly be causing it?