I recently started having irregular periods. My doctor prescribed first Yaz and advised me that I could take it uninterrupted to prevent having a period at all. I had a tubal ligation several years ago so I do not need it as a from of birth control. When I experienced breakthrough bleeding he prescribed Alesse which I had taken before. Again I have experienced the same problem. I started to bleed for six days on day 16 of the 21 day package. I have continued to take the pills but it is not correcting itself. This is more frustrating than the irregular periods were. What should I do? Do I have to keep trying different brands or will it fix itself after three months or so?