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However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days. The rhetoric of "natural" in natural childbirth: childbearing women's perspectives on prolonged pregnancy and induction of labour.
You may know when your LMP was, but not when you actually conceived. Soc Sci Med 59(7): 1397-408 Heo I was given the 23rd of january as my due date however based on the fetus age from scan I'm 24 1 day preganant which wpuld make my due date the 6th of January not the 23rd when counting 38 weeks from conception. Does a dating scan date a pregnancy from around about the day of conception?
Ask your GP if you want to have one anyway for extra reassurance, as she may be able to refer you.
Dating scans are the most accurate way of predicting your due date.
It may lead to you being given a high risk factor when your baby is actually developing normally (false positive result). National Collaborating Centre for Women's and Children's Health, Clinical guideline.
You can have the combined screening test from 11 weeks to 13 weeks plus six days, or when the head-to-bottom measurement (CRL) is 45mm (1.8in) to 84mm (3.3in).
However, some major problems can be seen at your dating scan, such as issues with the umbilical cord or with your baby's skull or abdominal wall. Antenatal Screening for Down's syndrome, setting standards to improve women's health.