M.T.
Unless you missed a pill or two, the percentage rate of you getting pregnant has not increased. However, breakthrogh bleeding could mean you're not on the proper birth control pill for you. I've been on birth control for years and one thing the gyno has continuously told me is sometimes your body gets "use" to the pills and you need to switch to prevent breakthrough bleeding. I definately think you should call your gyno's nurse to get a message to him.