Short cycle and previous pregnancy?

Mesha • Hubby and I have been together 8 years. Have a 2 year old boy and due in June with baby girl!
Anyone have a short cycle and have that effect your due date on a previous pregnancy? Either the doctor changed due date or baby came early? I have a 21 day schedule and I'm reading that may effect my due date as opposed to the typical 28 day cycle. 

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