Perinatology

Stephanie • My names Stephanie, I`m 25, a wife and mom to two kids, and expecting #3!
I called to schedule my 20 week scan and my doctor put me in to have it with a perinatologist(high risk). I haven't been considered high risk for my pregnancy. Is this normal? I'm assuming it's because it's an anatomy scan and they just want to make sure everything is all okay? Has this happened to anybody else?