What a first period is usually like
Periods usually start around age 12, but some people start earlier and some later. A period can last between 2 and 7 days, and about 5 days is common.
Why early cycles are often irregular
For the first few years, periods often don't come on a regular schedule while your body settles into a pattern. Cycles longer than 38 days are common for a few years after a first period.
Keeping track helps you and your doctor see whether your cycles are getting more regular over time.
How to keep track
The simplest way is to mark the first day of each period on a calendar. Add the day it ends if you can. After a few months you'll be able to see how far apart your periods are.
If you'd like to use Period Tracker, anyone 13 or older can create a free account. If you're under 18, look over the Terms of Use with a parent or guardian and ask for their permission first. There's a first period option that keeps the dashboard simple, and accounts set to the Under 18 age group don't show fertility details in the calendar, emails or monthly reports.
What to have with you
Your first period can start anywhere, including at school. It helps to carry a pad or two in your bag and to know how to use pads or tampons before you need them. A parent, school nurse or another trusted adult can help with this.
When to talk to a doctor or a trusted adult
Talk to a doctor if:
- Your periods haven't started by the time you're 15
- A period lasts longer than 7 days
- You miss 3 periods in a row
- Anything about your period worries you
Asking questions about periods is normal. A parent, school nurse or doctor has heard them all before.
Sources
- Periods, NHS
- Irregular periods, NHS
- Missed or late periods, NHS
- Your menstrual cycle, Office on Women's Health
- Concerns Girls Have About Puberty, HealthyChildren.org (American Academy of Pediatrics)