Accurate 10 week dating scan mary catherine gallagher is dating

Traditionally the last menstrual period has been used to date a pregnancy, but this may be highly inaccurate.A simple formula is to take the first day of the menstrual period, subtract three months and add one week.

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I discovered I was pregnant unexpectedly, and went to have an ultrasound on May 23rd.

Due to having wavering periods, I never really keep track, and therefore I don't know when my last period was.

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.

For instance a dating scan done at 6 weeks could get the date wrong five days either way.

A scan at 12 weeks could get the date wrong seven days either way and a scan done at 20 weeks could get the date wrong up to ten days either way.

The heart beat of the embryo can be seen from 6 weeks onwards, therefore, the Early Pregnancy Baby Scan can be performed from 6 weeks 0 days – 10 weeks 6 days from the first day of your last menstrual period (LMP).

If your menstrual cycle is longer than 28 days it is advisable to wait until you are at least till 8 weeks from your LMP to confirm the viability of the embryo as you may not be as far as your dates suggest.

You are required to have an adequately full bladder for your early pregnancy scan.

There is certainly no need to be uncomfortably full.

Usually two scans are done during the first trimester.

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