Well first of all, you could be pregnant so I would advise you to take the test before you do anything. However, once you stop taking birth control it take take up to a year for your cycle to become regular again. If I were you I would just start taking the new pack on the next sunday because more than likely that alone will bring about your period for the next month. If your not as impatient as I am I would definitely call your doctor and just explain the situation to him, he will have answers!

good luck