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 will my 12 week scan be?

If youre pregnant in England youll be offered an ultrasound scan at around 10 to 14 weeks of pregnancy. This is called the dating scan. Its used to see how far along in your pregnancy you are and check your babys development.

Do scans measure from conception?

Fetuses grow quickly, and they also follow the same pattern of growth in virtually every case. That means that by measuring the size of the fetus and looking for certain distinguishing characteristics, an ultrasound can give an accurate estimate of when you conceived.