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I accidentally took my contraceptive pill twice in the same evening.

Taking two doses of your contraceptive pill in one evening by mistake is not dangerous. You can just continue taking one pill a day until you finish the pack. The active pills all have the same amount of hormones, so taking an extra dose won't affect effectiveness. Since the yaz pill has 24 active pills and 4 inactive pills, missing one pill should not decrease its effectiveness. Just continue with your regular schedule.