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Just wanting to know if any others have had an EDD from a scan that was different to the EDD calculated based on their LMP (last menstrual period).

Which was correct in the end – the LMP due date or the estimated date of the scan?

[7 Facts Women and Men Should Know About the Vagina] "The beginning of changes in the cervix happen internally, not externally," Berghella told Live Science.

That's why manual exams don't predict labor very well: Because the changes are happening internally, doctors can't feel them from the outside.

Because of this, pregnancy is calculated from the first day of your last menstrual period (or LMP). It can be pretty difficult to determine a due date using the date-of-last-period method for women with irregular cycles — which is why an ultrasound exam is often required to determine gestational age.

From that day, 40-weeks of pregnancy is officially counted, and your doc or midwife busts out the red pen and marks your due date on the calendar. (An early ultrasound, usually done at about 6 to 9 weeks, can give the most accurate due date estimation by measuring the size of the embryo or fetus.) However, many pregnancies are confirmed by a Doppler heartbeat monitor, not an ultrasound.

Measurable changes To answer that question, Berghella looked at five studies in which researchers used ultrasounds to measure cervical length of a total of 735 pregnant women.

After all, unless you went the IVF-route, your physician has no way of knowing the exact time of conception.A simple ultrasound could help with this decision, new research suggests.Ultrasound measurements of the cervix, the passageway at the entrance to the uterus that opens up to make way for a baby during delivery, can reveal whether labor is likely within the next week, according to a new study.However, studies have shown that women who have a short cervix, less than 1 inch (2.5 centimeters) long, as measured on ultrasound scans during mid-pregnancy, are at high risk for preterm birth.That made researchers wonder whether similar scans could be predictive during the homestretch of pregnancy.

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