I’m 17 weeks pregnant

I just had my appointment today and they didn’t do an ultrasound once again. They told me they try not to hit baby with radiation or study show it could cause ADHD ? But I have not had an ultrasound done in the past two months and I haven’t gotten any pictures and this is my first pregnancy. I’m not sure if this is the normal now has anyone heard of this? I felt like my family members used to receive pictures at least every other appointment or every appointment where I have only received one and it was when I was six weeks pregnant and I haven’t had an ultrasound since I was 10 weeks.