A fertility calendar can be used for many purposes, such as to predict the timing of one's period and ovulation, to determine the optimal time for one's pregnancy, or to aid in the planning of one's birth control. A fertility calendar can also be useful for tracking one's personal health information, such as the date of one's last menstrual period.

A fertility calendar is a useful tool for women who are trying to conceive a baby. It can help to monitor the fertility of the mother and the father, and it can also be used to keep track of the day on which one can expect to conceive.

A fertility calendar can also be useful for women who are trying to avoid pregnancy. It can help to monitor the fertility of the mother and the father, and it can also be used to keep track of the day on which one can expect to ovulate.