Hello, I have gone through your query and understood your concern. If you have been taking the pill regularly without missing any of them, your cycle is protected and the chances of pregnancy are very minimal. Whenever oral contraceptive pills are initiated for the first time, it is mandatory to use additional protection for the first couple of cycles since inhibition of ovulation due to hormone effect may not happen in the first cycle itself. Abnormal menstrual pattern including absent or irregular periods is a feature of pill usage. In the current scenario, I would ask you to see a specialist for further management if you become overdue by ten days. Hope this helps.