How many ultrasounds do I need during a pregnancy?

This varies based on the woman and her pregnancy. If you have a healthy pregnancy, you'll only need two ultrasounds (down syndrome and detailed structural screening). The first one is usually scheduled for late in the first trimester, around the 11 to 14-week mark. The second ultrasound comes around 18 to 20 weeks. Some patients may have their first ultrasound prior to 11 weeks.