30day cycle to 21 day cycle

Katie

Has anyone experienced your period coming really early? I’m averaging 30 day cycles some months 29 others 31 or 30. I’m regular every month, however this past cycle I had a 21 day cycle. The only thing that was different was I had my first ever flu jab. Two days prior. Has anyone else had a cycle which was a lot shorter? Just waiting to see what happens this cycle.

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