Think of your monthly cycle as a detailed, 4-part mission run by your body. It all starts when you hit puberty!
The Starting Line: Your cycle officially begins on the very first day of your period (the first day you see blood) and ends the day before your next period starts.
Average Length: Most cycles are about 28 days long, but anywhere from 21 to 35 days is usually normal
How it Happens: If the launched egg (from Ovulation) meets a sperm, they combine, and a pregnancy starts!
The Fertile Window: You can only get pregnant around Ovulation. Since sperm can live for a few days, having sex in the days leading up to and on Ovulation Day increases the chance of pregnancy.
It's common to start your period around age 12. During this time, your body is still figuring things out, so mood swings and other symptoms are normal!
These are just a few things to keep in mind for your health:
Missing Milestones: If you haven't started growing body hair (like underarm or pubic hair) by age 13.
Late Start: If you haven't had your first period by age 15.
If either of those things happen, it's a good idea to chat with a parent or doctor!