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The scan date is usually later than the period date, so accurate dating has been found to reduce the number of women having labour induced because their babies are overdue.The first scan can check that your baby has a heartbeat and is developing normally. I didn’t find out I was pregnant with Daniel until I was at least 10 weeks along.
If the blood test is taken too early because your dates are wrong, this might lead to you being given a high risk factor when, in fact, your baby is developing normally. The length of your pregnancy is calculated from the first day of your last menstrual period (LMP), even though you don't actually conceive until 14 days after your LMP, and later than this if your cycle is longer than 28 days.For example, about one in 20 women will appear to be at high risk from the nuchal translucency scan to assess the risk of Down's syndrome, but most of these babies will turn out not to have Down's syndrome. My tech said "it looks like a girl" but the girl parts were VERY clearly there. This is because blood tests for Down’s syndrome are not very accurate if you are having more than one baby. Kettering: National Down’s Syndrome Screening Programme Westfall RE, Benoit C. The rhetoric of "natural" in natural childbirth: childbearing women’s perspectives on prolonged pregnancy and induction of labour. Instead, you will be offered a nuchal translucency scan. Antenatal Screening for Down’s syndrome, setting standards to improve women’s health.