Periods can vary: This is normal. It is not unusual for the week of your period to shift due to stress or illness. In the first two years of having your period, irregular length is very common. Keep track of the first day of each period on a calendar. Looking at the pattern over 6-12 months is helpful and will give you an idea of what is normal for you.
Answered 8/18/2017
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This might be: Related to imbalance of estrogen and progesterone.
Answered 4/7/2019
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