Cycles can change: It is common for the interval of a period to change over time. It is normal for a period to come every 25-35 days or so. Sometimes people expect it to come on a certain calendar day. Try counting the days between periods and see if they are more consistent. If it still feels like a wild variation, consider having your thyroid evaluated, looking at stress, or looking at any meds you are taking.
Answered 5/1/2015
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