All women have a completely individual menstrual cycle, which is counted from the first day of menstruation to the day preceding the start of the next one. The average menstrual cycle phase is 28 days, but it can last 21 days only, or as much as 35. Bleeding can last from two to seven days.
Menstrual cycling is accompanied by rhythmic changes not only in the reproductive (hormonal) system but throughout the woman's body. The purpose of these changes is to prepare the body for pregnancy. A stable menstrual cycle is an essential indicator of a woman's health status. The beginning of the period is known as the first day of menstruation (the start of heavy bleeding), and its end is the final day before the new menstruation.
The cycle with a period of 28 days with a duration of 3–5 days and blood loss from 50 to 100 ml is considered to be ideal. You can use some apps to define your cycle or calculate fertile days so that you can be aware when there is a high chance of getting pregnant. To get the full picture, you will need to make notes for at least three consecutive months or use any fertile days calculator. Therefore, you are guaranteed not to miss any adverse changes.