HI, I have read your question and I understand your concern. Missing your period while taking birth control pills is usually no reason for alarm. Dianette and other birth-control pills introduce new hormones in your organism, which can affect your menstrual cycle by stopping your periods. But there are also other reasons why you can miss your period, such as stress, excessive exercise and dietary changes. If I were your doctor, I would address the aforementioned causes first, since you already did a pregnancy test which ruled out this possibility. Next I would change the treatment of mild acne from Dianette to topical agents. Cleansers such as Benzoyl Peroxide or Salycilic Acid work very well in most cases with mild acne.In the end, if you are interested in taking birth control pills, I would consider switching to another pill which would work better with your body. Hope I have answered your questions. If you have any further questions I will be happy to help.