Each cycle consists of three different phases controlled by the endocrine system. To get an accurate. The average menstrual cycle is 28 days longCycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens.
To get an accurate.
Heres how to accurately calculate cycle length. When you have that magic number you can plug it. Note the date on a calendar. Start from day 1 of your menses.
