Barometer is a reference/entertainment app that estimates cycle phases using a simple 28-day model. It is not a medical device, not a contraceptive method, and not a diagnostic tool. Do not rely on the app for medical decisions or for planning or avoiding pregnancy.
The app is provided "as is", without warranties of any kind, express or implied. The developer is not responsible for decisions taken based on the text or hints shown in the app.
For medical questions, consult a doctor.