There is no contraception method which has not been known to fail but the success rate in preventing pregnancy varies from one method to another. In USA, 53 percent of unplanned pregnancies occur in women who have been using contraceptives. There are many factors which lead to unplanned pregnancy due to contraception failure.
[Read: Birth Control Methods for Men]
The factors of contraception failure pointed out here should help you be better prepared to prevent unplanned pregnancy.
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