Seeing your baby on a screen can be a really exciting event.
You can also take your partner, friend or family member along to share the experience with you.
The main purpose of the scan is to check that your baby is developing normally, rather than whether you're expecting a boy or girl.
However, you may want to know your baby's gender, or ask for a photo of your scan.
A small amount of ultrasound gel is put on the skin of the lower abdomen, with the ultrasound probe then scanning through this gel.
"Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age" .
The first trimester is months one, two, and three of your pregnancy.
Below are scan pictures taken during the early weeks of pregnancy.
Transabdominal ultrasound will provide a panoramic view of the abdomen and pelvis and is noninvasive, whereas transvaginal ultrasound provides a more limited pelvic view and requires insertion of a probe into the vagina.
Transabdominal ultrasound cannot reliably diagnose pregnancies that are less than 6 weeks gestation.