i havent missed a period but the last 2 have become lighter and this last one was lighter, i have been working out more just lately but i have also gained some weight, it is usually harder for me to gain weight so i'm not sure what could be happening i have been on birthcontrol for about a year, sometimes i forget a day and forget to make it up and i have been with my boyfriend for about 2 years and we have unprotected sex since im on the pill but i was just wondering what could cause the irregularity in my period? or the weight gain? the exercise maybe? please answer to the best of your knowledge.