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Your menstrual cycle

The chart below is based on a sample 28-day menstrual cycle. Every woman is different, though, in how long her bleeding periods last and how many days come between them. For example, your cycle could be as short as 23 days or as long as 35. To learn about your own pattern or schedule, it can help to keep track of your periods on a calendar. Keeping track will help you to better know when to expect your next period and let you know if you haven’t gotten it in too long. Create your own girlshealth.gov Cycle Calendar.

The menstrual cycle includes not just your period, but the rise and fall of hormones and other body changes that take place over the month. At first, your periods may not be regular; you may have 2 in one month, or have a month without a period at all. Periods will become more regular in time. If you’re concerned about your cycle, learn about problem periods.

(If the tool above does not appear, please take a look at our text version of this tool.
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Every woman is different in:

  • The number of days in between periods
  • How long periods last

To learn about your own pattern or schedule, it can help to keep track of your periods on a calendar. Keeping track will help you to better know when to expect your next period. Learn to use the girlshealth.gov Cycle Calendar.

Learn about problem periods.

 

Content last reviewed October 13, 2010
Page last updated April 09, 2014

U.S. Department of Health and Human Services, Office on Women's Health.

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