May be normal: We count cycle length from the first day of one period to the first day of the next and any where from 21 day to 35 days is normal. Some sources say that can be up to 42 days. Obviously, with months lasting 28-31 days, that means skipping some months can be normal. Keep a calendar to know if your periods are regular and determine your cycle length. Hope this helps.
Answered 7/27/2017
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