Early pregnancy can feel unreal. How do you know the fetus is there when you can’t see it or feel it moving yet? So the first ultrasound picture can feel momentous: Finally, your whirring brain can be placated with direct proof. But other than the visual evidence that you’re not dreaming all this, you may not know what to expect from prenatal ultrasounds. We’re here to walk you through it. For this guide, I interviewed two obstetricians who specialize in ultrasounds — and a radiologist whose observation led to a diagnostic breakthrough — to find out what you need to know about prenatal ultrasounds.