https://medium.com/bloomberg-businessweek/its-tough-being-the-first-birth-control-app-170077ace824 > Bloomberg BusinessweekBlockedUnblockFollowFollowingApr 1A Natural Cycles branded thermometer, which the company sends to users of its fertility-tracking app. Photo: Caroline Tompkins for Bloomberg BusinessweekBy Esmé E Deprez > Late one evening last February, Raoul Scherwitzl posted a tweet that, even in this age of oversharing, might have seemed a little too personal: He and his wife, Elina Berglund, would stop trying…