Before the scan you will be asked to drink a lot of water and have a full bladder, as this puts the uterus in a better position to be scanned.This can be something of an uncomfortable challenge if your sonographer has particularly long waiting times.Have you recently found out that you're pregnant, but you're confused about how many weeks pregnant you really are, or when your baby will be due, don't worry... Often people measure the number of weeks from their last known menstrual period date (LMP) which is fine, but your baby won't have been conceived then, it's most likely sometime around 2 weeks after your LMP that your baby was created and started to grow.Our dating scan is a short 2D (black and white) ultrasound scan to measure the size of the fetus to more accurately identify the GA (Gestational Age) and from this determine a due date.There are two routine scans in pregnancy and the first is called the 12-week scan or “dating” scan – this is because one of the things it looks at is the exact gestation, giving a better idea of your baby's estimated due date.
Here are the main checks they'll be making: Your baby will be measured and the exact stage of pregnancy will be calculated from the measurement made from crown to rump.
This will give you a more precise estimated due date.
Are you expecting just one baby, or could it be twins or (gulp) even more?
NICE recommends it's done between 10 weeks and 13 weeks.
You will have had earlier appointments and may have had an early scan if you've had any concerns such as bleeding, but otherwise this is the first time you'll get to see your baby, so it's a real milestone in your pregnancy.