Understanding the Menstrual Cycle The Menstrual Cycle The menstrual cycle is the monthly series of hormone-driven processes that prepare a woman's body for pregnancy.e60dc2a1-f33c-4a05-9b50-8e3e8e597629c1f4b5df-857c-40f0-8b3f-a66ce49f0f2f The average cycle lasts 28 days, but it can range from 21 to 38 days. During each menstrual cycle, the uterine lining thickens to prepare for a possible pregnancy, and one egg matures in its follicle.e60dc2…