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How long does it take for my contraceptive pill to become effective?

The effectiveness of your contraceptive pill depends on when you started taking it in your menstrual cycle. If you started within the first 5 days of your cycle, it is effective immediately. If you started at a different time, you should use an additional form of contraception for 7 days. If you're unsure, it's best to use protection for 7 extra days.