I am eighteen years old, i had my period twice in April, two weeks apart and only 3-4 days long. The first one was light, the second was more on the heavy side. It is now June and I have not had my period. I was supposed to start a week ago, if following my usual pattern. I have stopped taking birth control during both months after taking it consistently for almost a year. I was last sexually active on the last weekend of March. Why haven t I started my period yet? Could i be pregnant?