Mayo Clinic Q and A: Irregular periods can be common at first

DEAR MAYO CLINIC: My daughter had her first period at 15. That was six months ago, and she hasn’t had a period since. Should I take her to see a health care provider, or is this typical? ANSWER: When they first start, periods in teens are often irregular. It’s not uncommon to go several months […]

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Is a lot of variation in my menstrual cycle normal? My cycle has been as short as 13 days and as long as 43 days (including my period). - Quora

If I'm not pregnant, why haven't I gotten my period in 7 months? - Quora

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I'm 13 years old. Is it normal that my period is irregular? I started my period on February of 2017 2 months before my 12th birthday. - Quora

Mayo Clinic Q and A: Irregular periods can be common at first

10 year old had her first period 2 months ago, but nothing since

If I'm not pregnant, why haven't I gotten my period in 7 months? - Quora

Why is it that so many young women don't know that if you have your period that means you are NOT pregnant? - Quora

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Mayo Clinic Q and A: Spotting, perimenopause and menopause - Mayo