<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi Dr I started duromines 15mg a week ago and I am on the pill contraceptive. I started experiencing stomach cramps for 5 mins and I bled for an hour but then my periods disappeared I am on the white pills which is my expected periods time. I am worried why my periods have disappeared, what could be the reason for this be?Thanks Mittie  <response>: Hi there I understand your concerns. It seems like you started a Chat Doctor. While it is common to have these side effects when you switch birth control pills, it is not going to have a great impact on your future pregnancies. The reason for disappearance of your periods is that your uterus might be maintained in a certain phase of the menstrual cycle not reaching menses itself. I hope you visit with a gynecologist if you are not comfortable with your current contraceptive method. I hope this helps. Take care and have a lovely day! 