How It Works
Your menstrual cycle is a part of reproduction. During each “cycle,” an egg is produced and your body readies itself for pregnancy. If you don’t become pregnant, then you get your period. Typically, a menstrual cycle is 28 days, although it is normal to have a cycle that is shorter or longer. Day 1 of your cycle is the first day of your period (the day you first see blood). That is the day the entire reproductive cycle starts over.