If you start it the first day of your period, its effective right away. If you wait until the sunday after your period starts you have a 7 day wait until its effective. Don't start it after your period if you can help it because it will try to work against your normal cycle. What that sunday after your period starts means is if you start your period on a wednesday for example, even if you still have your period, you start the pill on that following sunday.
Once you have started the pill, your period has no effect on your taking it. If you start bleeding while on the active pills you just keep taking the active pills. You never alter your schedule.
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