Your withdrawl bleed (on the pill, you don't have a real period) should begin whenever you're on your placebo pills (or stop taking the hormonal ones).
However, please keep in mind that beginning your pack a week later than normal will most certainly compromise your level of protection, and that you should use a backup form of contraception until the pack of pills after the week-delayed one. Additionally, spotting may still be a possibility, particularly when beginning a pack mid-cycle.
I hope this has answered your question!
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