doctor wont do an ultrasound?

so im 17 weeks and 1 day. i have an appointment on friday. my husband is chamging jobs and we are moving to a new state so i wont have insurance after this appointment until im 28+ weeks. i had a scan at 7 weeks where my doctor sent me to the hospital for my first scan. they did measurements and everything. i haven't had a scan since and i they havent done measurements on the baby or anything. i wanted it done before i left but my doctor refuses and i dont want to wait until 28+ weeks to make sure everything is normal. my doctor said she won't do it until 22 weeks and i dont know what to do. she doesnt care about my situation. what do i do. and elective ultrasounds wont do measurements or anything like that, theyre more just for fun than anything. any advice?