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Instead, you will be offered a nuchal translucency ultrasound.

Knowing about twins early is also useful if you want to have screening for Down's syndrome.This is because blood tests for Down's syndrome are not very accurate if you are having more than one baby.It may show a very minor problem, or something which may get better on its own. As with all screening tests, there can be false positive and false negative results. First, there’s the question of when the pregnancy began: some women know the date of ovulation or conception, but typically, due dates are based upon the woman’s last menstrual period, a method which carries much potential for error.

Second, there’s a question of how long the pregnancy will last.

In this paper, I will not address this emotional and psychological impact in much detail, but this data should be read with an awareness of this, because it certainly impacts the couples that we work with in childbirth preparation classes.

For example, as childbirth educators, we frequently see women who have reached the 38 week of pregnancy, where they’re told the baby is ‘no longer premature’ and the moms are ready for the baby to come.

But ultrasounds can also lift the lid on a few worries you might be having. The main reason for the ultrasound is to work out how many weeks pregnant you are, and to estimate your due date.

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.

The ultrasound 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 ultrasound can check that your baby has a heartbeat and is developing normally.