Pregnancy due date based on ultrasound dating Webcam show without membership

Want more information about how the weeks, months, and trimesters of pregnancy are counted?

pregnancy due date based on ultrasound dating-36

Subsequent scans done further into the second and third trimester have increasing margins of error, and can be erroneous by a factor of weeks.

ALSO READ: Safe exercises to close your belly gap after pregnancy The due date should be agreed on pretty early in the pregnancy, preferably by a first trimester dating scan.

As the phrase puts it, it’s an estimated date of delivery (commonly termed as EDD).

It’s never an accurate date, you may deliver several days before or after the EDD. The date has traditionally been calculated forwards based on the first day of your last period, but this presumes regular menstrual cycles of 28 days.

This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived.

Baby Center's Due Date Calculator uses the same approach that your provider is likely to use.

And your periods may have been pretty irregular prior to conception.

In such cases, a scan at the earliest opportunity will give a clue as to the potential delivery date.

It is immediately obvious then that women with irregular periods may have erroneously calculated EDDs.

The more precise method of calculating the EDD is based on ultrasound computations.

The initially agreed date should stand, regardless of what subsequent scans imply.

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