Fertility apps like Natural Cycles claim to be birth control. Don't trust them.
Natural Cycles is coming to Apple Watch. So is it safe to use as a contraceptive?
Natural Cycles vs. Daysy vs. Ava
Natural birth control: tools and apps like Natural Cycles or Daysy, what are the pros and cons • Cycle
Natural Cycles - Birth Control - Apps on Google Play
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I felt colossally naive': the backlash against the birth control app, Contraception and family planning
Inside Anti-Abortion Groups' Campaign to Sell Women on Unreliable Birth Control “Alternatives” – Mother Jones
Natural Cycles vs Daysy vs Ava: Which Fertility Tracking App Is The Best? - Fin vs Fin
5 Reasons couples choose NC° Birth Control
Contraception: Which is most effective? - BBC News