i think you should be fine. although i use the ortho evra patch, my boyfriend & i have unprotected sex everytime & i still have yet to become pregnant *knock on wood*

anyways....if you haven't had your period at all, it's probably just stress, or your body is trying to get adjusted to the hormones from the pill...it took me trying several different birth control methods before i found one that worked well....& like you...i'd go for months without bleeding or i'd bleed one day really light, or somethign like that. i wouldn't stress too much over it, but the best thing to do if you don't start in a few weeks is i'd just go to your gyno and ask them what is going on....more than likely it's nothing! but best of luck!