Cycle pattern

Brittany

I’ve been tracking my cycle for some time and there appears to be a pattern I do not understand. For about three months I have a 28 day cycle. The next month drops to around 26 days the next month around 28 and the next around 31. Then it repeats exactly three months 28 days then dropping and lengthening the next three then back again to 3 28 day cycles. Anyone have insight?!

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