12 week dating scan
Having a scan in the first few months of pregnancy can be a thrilling experience.It's amazing to see the little blob with a heartbeat that will soon become your baby.Older women are more at risk of having a baby with Down Syndrome.
There are many reasons for having an ultrasound at this stage, but one of the most common is to screen for one of the congenital chromosomal abnormalities – Trisomy 21, otherwise known as Down Syndrome.You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).This is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.This means that there is an extra chromosome – 21 contained in every cell of the body.People with Down Syndrome have physical and intellectual disabilities.
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5 ½ weeks gestation means 5 ½ weeks from the first day of the last menstrual period, which is usually about 3 ½ weeks from the date of conception (confusing, isn’t it!