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The pills protection starts at the first pill which is taken at the end of your period. The pill works by tricking the body into not releasing the eggs during the time that ovulation should occur. It thickens the cervical mucous making it difficult for semen to pass and thins the uterine walls, making implantation much more difficult. None of this takes 7 days. The hormone in the pill taken the day before, and the day of ovulation stops the ovulation that day. The uterine walls are thinned by your period, and the first pill taken stops the process of thickening, and the daily pills keep the process stopped. The cervical mucus is normally thick and thins just before ovulation, so again its the pill stopping a process before it happens.
The pill protects you from day one, however as you can tell from reading the paragraph above, missing the pill on the day you ovulate, or the day before you ovulate could be a very bad thing.
Now, if you were talking about Not taking the pills at all, then having sex in the middle of your cycle and then starting the pill for 7 or more days, that wont work and will most likely get you pregnant.
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