This is straight from the patient package insert for levora:
Reminder: If you forget any of the 7 peach "reminder" pills in Week 4: THROW AWAY the pills you missed. Keep taking 1 pill each day until the pack is empty. You do not need a back-up method.
The peach pills are just reminder pills. They do not contain any hormones. As long as you have taken the white pills in that pack correctly, you are protected from pregnancy during that week.