First trimester screening

Ashesha13

So I'm just today 11 weeks and 1 day and I have my paper work to get the bloodwork done for my first trimester screening, however the doctor isn't doing an ultrasound for it. My nurse practitioner originally said an ultrasound but the doctor said no ultrasound until AS at like 18 weeks since he found the heartbeat at our last appointment with the doppler he was set on the due date. Is it normal not to have an ultrasound for the 1st trimester screening? I'm just dying to see out little one already!