To avoid getting pregnant naturally without using user-directed contraceptive methods, it is necessary to monitor your menstrual cycle throughly. Even so, it is considered to be a birth control method of low-effectiveness, as the menstrual cycle usually depends on the woman's monthly body changes and sudden alterations.
Monitoring your menstrual cycle
By Andrea Rodrigo BSc, MSc (embryologist), Sara Salgado BSc, MSc (embryologist) and Sandra Fernández BA, MA (fertility counselor).
Last Update: 03/17/2016