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Very, very low. If 100 women are on the pill for a year whilst sexually active, three will become pregnant.
The theoretical rate, published by the manufacturers under controlled experiments, is one but the other factors enter into it giving a slightly increased rate. The other factors would include improper timing (or missing) a pill, other medications or supplements or illness with high basal temperature.
There is no way to tell the rate as you ask it. We do know that in unprotected sex during the fertile period only one live birth in four acts occurs.
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Brandye
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