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Fertile-window misclassification in period-tracking applications and associated pregnancy risk: a large observational analysis

2026-02-14 obstetrics and gynecology Title + abstract only
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ObjectivesGiven the widespread use of period-tracking applications and evidence that some users rely on fertile-window predictions for pregnancy prevention, we aimed to quantify pregnancy risk arising from misclassification of biologically fertile days by period-tracking applications, and to compare this risk across calendar-based and basal body temperature (BBT)-supported period tracking and a digital contraceptive regulated as a medical device. MethodsWe conducted an observational analysis of...

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