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How to calculate the expected due date?

To calculate the EDA (estimated date of birth), the Nägel formula is used:

To do this, you need to add 40 weeks to the first day of the last menstruation, or count 3 months from the first day of the last menstruation and add 7 days to the resulting number.

Everything is not as complicated as it seems, but it is better to trust your obstetrician-gynecologist.