From what I understand, 3-4 months is the normal "regulation" time for your body to adjust. Hopefully this will be it for you and you'll start to go back down. I can honestly say that if I continued to gain weight, I would talk with my physician and examine alternatives. Gaining 40 lbs in one year because of birth control pills is, to me, putting one's health at risk. Not to mention the emotional side effects. Good luck.