Hello, and I hope I can help you today. Many women stop menstruating while they are taking birth control pills, especially after long-term use. This is because the tissue lining the uterus called the endometrium, becomes so thin that there is too little to be visible externally during the free week. Because all birth control pills contain progesterone, which suppresses your uterine lining, even switching to a pill that has a slightly higher dose of estrogen can sometimes not produce a menstrual cycle. So there is no harm in missing a menstrual cycle while you are on birth control pills. If you took all the pills in the package to close to the same time every day, and use them correctly, your pregnancy risk whether or not you get your period is still less than 1%. So I do not think that you need to be worried about pregnancy in the situation if you are taking your pills correctly and do not feel any different or exhibit any other symptoms of pregnancy. I hope I was able to adequately answer your question today, and that my advice was helpful. Best wishes, Dr. Brown