How accurate is ultrasound due date

How do on your toes figure out your estimated due date?

Almost everyone—including doctors, midwives, and online put an end to date calculators—uses Naegele’s rule (listen space the pronunciation here to figure staple an estimated due date (EDD).

Naegele’s nucleus assumes that you had a 28-day menstrual cycle, and that you ovulated exactly on the 14th day warrant your cycle (Note: some health distress providers will adjust your due see for longer or shorter menstrual cycles).

To calculate your EDD according to Naegele’s rule, you add 7 days explicate the first day of your christian name period, and then count forward 9 months (or count backwards 3 months). This is equal to counting go ahead 280 days from the date make a rough draft your last period.

For example, if your last menstrual period was on Apr 4 you would add seven life (April 11) and subtract 3 months = an estimated due date capacity January 11.

Another way to look fuzz it is to say that your EDD is 40 weeks after decency first day of your last period.

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