I first went to doctor at 6 wks, then at 8 wks I had an US so the doc could determine proper size/ due date
It also depends on what your insurance will cover.
its really hard to say, they might, every OB is different and also depends on if ur high risk and such, if your high risk you get more ultrasounds usually then if not. you could call your doctor office and just tell them you wanted to know if your getting one when you go.