Why would I have a dating scan? A dating scan might be recommended before 12 weeks to confirm your due date if you are unsure of your last menstrual period or your date of conception. The scan is optional and not everyone will have it. You can discuss whether you want or need a dating scan with your doctor or midwife.
When is your 12 week scan counted from?
Although sometimes known as the reassurance and viability scan, your 12 week scan is more typically referred to as the dating scan. Bear in mind that you may not have your scan at exactly 12 weeks; it usually takes place between your 8th and 14th week of pregnancy.
Do ultrasounds go by last period?
An ultrasound is actually the most accurate way to date a pregnancy because all fetuses grow at a consistent rate during the first trimester and early second. In other words, if your baby measures 9 weeks 2 days when you have your ultrasound, thats how far along you are, no matter when your last period was.
What should I do before my 12 week scan?
Mama-to-be: what to expect at the 12 week scanThink about who youll take with you. Be prepared for a change in your due date! Drink plenty of water- but not too long before your appointment! Wear suitable clothing. Brace yourself.Oct 31, 2013
What should I wear to my 12 week scan?
Wear suitable clothing. Wear loose fitting clothes for easy access and to limit the spread of the gel. A top that can easily be lifted whilst maintaining your modesty, plus a skirt or trousers that can be rolled or pushed down at the waistband are best. The gel will wash off easily too.
Do you count weeks pregnant from conception?
The unborn baby spends around 38 weeks in the womb, but the average length of pregnancy (gestation) is counted as 40 weeks. This is because pregnancy is counted from the first day of the womans last period, not the date of conception, which generally occurs two weeks later.