Busty dates - Dating scan accuracy

It records high-frequency sound waves that create an image (see Reference 4).

Normally, ultrasounds before until week 4 of pregnancy shows nothing in the uterus and serve no purpose.

Transvaginal ultrasound can see embryonic development about a week before transabdominal ultrasound, the American Pregnancy Association (APA) states.

That's the job of your next routine scan at about 20 weeks, when more detail can be seen as your baby grows bigger.

However, some major problems can be seen at your dating scan, such as problems with your abdominal wall or with your baby's skull.

You may need a second scan to check the first scan's findings.

The dating scan will also show if you're expecting twins, triplets or more.

Ask your GP if you want the reassurance of an early scan. The scan's main purpose is to work out accurately how many weeks pregnant you are and estimate your due date.

You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).

A positive fetal heartbeat at this stage indicates a 95 percent chance that the pregnancy will proceed normally, according to Dr. Early transvaginal ultrasound, the most reliable way to determine a pregnancy due date, can date a pregnancy within a few days and is more accurate than determining a due date by the date of the last menstrual period.

Having a scan in the first few months of pregnancy can be a thrilling experience.

Failure to see the heartbeat at this stage may indicate an abnormal pregnancy.

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