The birth control is made for a 28 day cycle. You take birth control pills for the first 21 days because they release a steady supply of the hormone that stops egg production. If you miss one dose, it interrupts the steady supply of the hormone thus increasing the chance of becoming pregnant. The seven pills you take during your cycle are just to help you to remember to take the pill. I hope this makes sense. My sister was on the pill for years after having her daughter. She accidentally forgot her pills at home when her and her husband had to make an emergency trip to another state. She thought she was okay because she had been taking the pill for over six years. Nine months later her husband and her had a second daughter.
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