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How long will my first period last?

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This can vary! Your first period may last from two to seven days. Then, there might be 21 to 40 days or even longer before you have another one, which might be heavier or lighter than the first. Your periods should become more regular within two years after you start menstruating. Talk to your primary care doctor or your gynecologist if:

�Your cramps are severe

�You bleed a lot, for longer than seven days, or at the wrong time of your cycle

�You haven't had your first period by age 16

�It's been three months since your last period

�You think you might be pregnant

�You get a fever and feel sick after using a tampon

From: All About Menstruation WebMD Medical Reference

SOURCES: 

Iwannaknow.org: "Puberty." 

WebMD Medical Reference:  .  Normal Menstrual Cycle

Cool Nurse.com:  "What You Need to Know About Menstruation."

American College of Obstetricians and Gynecologists: "Especially for Teens: Menstruation." 

The National Women's Health Information Center: "Menstruation and the Menstrual Cycle."

Tampax: Usage questions: "Can I use a tampon overnight?"

Reviewed by Dan Brennan on April 18, 2019

SOURCES: 

Iwannaknow.org: "Puberty." 

WebMD Medical Reference:  .  Normal Menstrual Cycle

Cool Nurse.com:  "What You Need to Know About Menstruation."

American College of Obstetricians and Gynecologists: "Especially for Teens: Menstruation." 

The National Women's Health Information Center: "Menstruation and the Menstrual Cycle."

Tampax: Usage questions: "Can I use a tampon overnight?"

Reviewed by Dan Brennan on April 18, 2019

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