What is Menstrual Cycle?

The menstrual cycle is the monthly hormonal cycle a female’s body goes through to prepare for pregnancy. Your menstrual cycle is counted from the first day of your period up to the first day of your next period. Your hormone levels (estrogen and progesterone) usually change throughout the menstrual cycle and can cause menstrual symptoms.
Your menstrual cycle runs from the first day of your period to the first day of your next period. This takes about 28 days (four weeks), but different people’s cycles vary between 21 and 42 days (3–6 weeks).