Generality
The menstrual calendar is an important tool that allows you to know and monitor the status of your menstrual cycle.
In fact, during the period between one menstruation and the next, the woman's reproductive system undergoes various structural and functional changes, which recur every month. These changes occur from puberty to menopause and are directly related to reproduction and fertility.
For these reasons, annually noting the start of menstrual flow on the calendar or on the diary is a good habit to adopt in order to have a more precise idea of the duration and regularity of one's cycle and to recognize its alterations.
This tool is also useful for clearly identifying the most fertile days, should you wish to undertake or postpone a pregnancy.