What should I do

So I am 35 weeks and six days pregnant with my little girl and this is my first pregnancy and for some reason during my whole pregnancy I’ve only gotten four ultrasounds I was supposed to get one at 32 weeks I went in and they never gave it to me so I haven’t had an ultrasound since I’ve been like 26 weeks and I know my medical card will pay for it because I have a good medical insurance but I just don’t know why they won’t give me one so should I ask my doctor about it or??