A pregnancy ultrasound is a test that uses high-frequency sound waves to image the developing baby as well as the mother's reproductive organs. The average number of ultrasounds varies with each pregnancy.

How many scans do you have during a pregnancy

Hospitals in England offer all pregnant women at least 2 ultrasound scans during their pregnancy: at 8 to 14 weeks. and between 18 and 21 weeks. How do I know how many weeks my pregnancy is
Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP).

What is ultrasound for pregnancy called

Ultrasound (also called sonogram) is a prenatal test offered to most pregnant women. It uses sound waves to show a picture of your baby in the uterus (womb). ... Most women get an ultrasound in their second trimester at 16 to 20 weeks of pregnancy.