Natural fertility at your age is very low but pregnancy is possible. If you stop taking the pill and there is no return of periods after 6 months (please use condom), you don't need to use contraception anymore. In case of return of periods you will need to use contraception for an extra year after the last period. It may sound overcautious but this recommendation is based on my experience! I should mention that there isn’t a test to predict the return of your periods while you are on the pill.