ultrasound W/Out doctored referral

Latoya
Haven't had a ultrasound since I was 22 weeks my midwife said that I wouldn't be getting any more due Ginny baby looking fine. But all I herd was blah blah lol do you know if I can jus schedule my own ultrasound at a hospital or some source to have an ultrasound don't really wanna pay out of pocket for a 3D ultrasound. I have private insurance on a PPO plan so idk if they helps