How Is My Expected
Date of Delivery Determined?
Normally, your due date is 280 days (40
weeks) from the first day of your last period. However, if your periods are
not regular or are not 28 days in cycle, your due date may be different from
the "280-day rule." Your health care provider may order an ultrasound to
more accurately determine your due date.
If you are certain of your conception date
(the date when you got pregnant), please tell your health care provider.
This information can be helpful in determining your estimated date of
delivery (EDD)
A full-term pregnancy lasts from 37 to 42
weeks, so your actual date of delivery can be different from your estimated
date of delivery, which is sometimes called estimated date of confinement,
or EDC. A very small number of babies are actually born on their due dates.
