I got told that if you miss a pill in your first week, you arent protected and not to have unprotected sex for the next seven days, then resume as normal. if you miss a pill in the second week..even two, youre protected.. and you dont have to use anything. then in the last week youre still protected but not to have your break, go straight onto another pack.
you are still protected in your week's break, thats what the leaflet says, just have to make sure you start your next pack correctly on the right day.
also, my leaflet has said that as long as you take your pills correctly, if you miss a period this is normal and not to worry. although personally, id freak out and take a test anyway..