pregnant?

I have been on Orthotricyclin Lo for over a year now and this month i had a little slip up. There are 3 weeks of active pills; white for 7 days, light blue for 7, and dark blue for 7, then there are the green nonactive pills. During the first week i was missing a white pill and my drs was closed and i didn't have another pack to borrow from. I had extra light blue pills so i took one of those in its place (i took 6 white pills then 8 light blue and 7dark blue). I am now currently not taking any because this is the week my period is supposed to come. It usually starts today in the morning some time, its now going on 4 and i'm getting nervous. Does anyone know my chances of getting pregnant from the change of pills? I'm hoping its just a little off schedule this month...I've also got another question, i know that you don't have to take the nonactive pills but what are your chances of getting pregnant during that week? Any comments would be much appreciated!!