The Food and Drug Administration will allow a pregnancy-prevention app to conduct marketing and advertising. Natural Cycles, a Swedish app, is intended to be used as a form of contraception, using body temperature and menstrual cycles to predict fertility; users pay for a subscription and use a special thermometer to track their fertility. The FDA was reviewing the app after it faced backlash in Europe after women reported becoming pregnant while using the method. The algorithm-based app has a "typical use" failure rate of 6.5 percent, the FDA said, meaning that 6.5 in 100 women who use the app with an average amount of misuse will become pregnant. Birth control pills, in comparison, have a 9 percent failure rate with typical use.

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