How accurate is the Oura Ring when used as a method of birth control?

The Oura Ring is not designed as a method of birth control and should not be used as such. It is primarily a sleep and activity tracker that monitors various physiological signals, such as temperature, heart rate, and movement. While it does track temperature trends which can be related to the menstrual cycle, the Oura Ring has not been tested or approved for fertility tracking or contraception by regulatory bodies like the FDA. Individuals seeking reliable methods of birth control should consult with healthcare professionals for options that are clinically validated for this purpose. There are dedicated fertility tracking devices and apps that are specifically designed to help predict fertile windows, but even these should be used with caution for contraception, as they vary in their accuracy and effectiveness.