Identify safe and unsafe days in your cycle using the calendar method.
Calendar method has ~24% typical-use failure rate. NOT reliable contraception alone. Consult your OB-GYN.
The calendar (rhythm) method estimates fertile and safe days based on historical cycle data. It identifies the fertile window (days most likely to result in conception) and marks surrounding days as relatively safe. This method works best for women with very regular cycles and is most effective when combined with cervical mucus monitoring and BBT tracking (symptothermal method).
Medical Disclaimer: This tool is for educational purposes only and should not replace professional medical advice. Always consult a qualified healthcare provider.