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At eight weeks The developing embryo measures about 1cm to 2cm and should now be easier to see on the scan.

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A vaginal scan is done by introducing a probe into your vagina. Abdominal scan After 10 weeks and for the rest of your pregnancy, you will have an abdominal scan.

However, if the doctor needs to check your cervix (mouth of uterus and birth canal), a transvaginal scan may be done as it is more accurate.

The crown to rump (head to bottom) length of embryo is measured to calculate your due date.

At seven weeks A tiny embryo with a heartbeat can usually be heard.

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

It's wonderful to see the little blob with a heartbeat that will become your baby.

At 10 weeks Your baby measures 3cm and the heartbeat can be seen and heard.

In the next few weeks you will be due for an early morphology scan (NT scan).

At six weeks (four weeks after conception) The yolk sac may be seen as a small white circle in the gestation sac.

The yolk sac is attached to the embryo and contains nutrients to feed it while it is developing.

She will be able to identify where the sac has implanted in your uterus to rule out an ectopic pregnancy.

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