ortho tri-cyclen lo contains a low amount of estrogen. sometimes your own hormones can rule over the pill form that you are taking. other factors can also throw off your cycle like stress. sometimes women’s’ hormones can also "talk" to each other causing women in the same vicinity to become regulated to the same cycle. if you have just started a new job or school where you are hanging out with other women every day your cycles can become synced with theirs. before you start a new pill pack you may want to take an at-home pregnancy test. keep an eye on your cycles and if they are continually irregular you may need a different type of birth control.
i have been on ortho tri-cyclen lo for nearly a year. my period started a week early this month. what could this mean?