Marginal previa. Marginal previa, also called low-lying placenta, ... Doctors often diagnose placenta previa during an ultrasound on one of your routine prenatal visits.

Marginal cord insertion sounds similar but is a distinct condition: ... While your ultrasound technician or healthcare provider could pick it up on an ultrasound ... Vasa previa, meaning the blood ...

If you have a healthy pregnancy, you'll only need two ultrasounds. The first one is usually scheduled for late in the first trimester, around the 11 to 14-week mark. The second ultrasound comes ...