Why might the due date change?

Your estimated due date is just that – an estimate! It’s used to schedule your dating scan in the first trimester. During this scan, you may be given a more precise due date.

The method above is based on a 28-day cycle. If your cycle is longer or shorter than this (or varies month-to-month), it could affect your due date as well. Once again, your dating scan will likely give you a more accurate date.

 

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