U.S., May 6 -- ClinicalTrials.gov registry received information related to the study (NCT07566793) titled 'Validation of Effectiveness on NaturalCycles Users' on Nov. 18, 2025.
Brief Summary: The goal of this observational study is to measure the effectiveness of the Natural Cycles digital birth control application at preventing pregnancy in sexually active women aged 18 to 35 with no known history of infertility. The main questions it aims to answer are:
* What is the pregnancy rate of the application over one year, for all users?
* What is the pregnancy rate of the application over one year, for users who follow the application's instructions perfectly?
Participants will:
* Use the Natural Cycles application for birth control for up ...