What does Tricare cover for pregnant women?

Helen • 24y/o Air Force wife💙. MOM to a Feb ‘19 babe and soon to be Aug ‘21 babe!

I went to the OB Orientation at my base today and they said that gender ultrasounds aren’t covered but what I’m wondering is how many/which ultrasounds does Tricare cover? My husband and I have Tricare Prime and we are seeing a civilian OB since our base doesn’t have a hospital or women’s health provider.