It can take your body 2 to 3 months to adjust to birth control. So u might experience irregular bleeding, nausea, and breast tenderness during this time, but that should clear up by 3 months. However, if u experience severe headaches, blurred vision, increased depression/irribility, shortness of breathe, chest pain or extreme pain in the arms or legs then stop taking the pills and call your doctor. As for the weight gain, BC can increase appetite which can lead to overeating, which can lead to weight gain, but if u watch what u eat, u should be fine. goodluck.
doris,
reproductive health assistant