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I'll answer both personally and medically. As a teen, the interval between my periods varied from two weeks to six weeks. As I aged, this finally stabilized when I was about 17. Pretty typical.
I have patients who have four periods a year irregularly and I have them who have periods every two weeks. Those two are in treatment. Extreme physical stress (sport training) can cause the period to stop for months - even a year or more.
For teens a very broad range is normal. After one gets all the hormones balanced, individual, typical women may vary three days or so either side of the expected date. Illness, stress or medication can cause this to vary. Women who vary are often put on the pill to regulate the system. This is medication with contraception as a by-product.
For the last several years (in my 30s), every fourth Tuesday, I feel crappy and every fourth Friday, there it is.
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Brandye
Don't wear cheap bras!
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