After pregnancy ultrasound??

I’m a ftm, I am worried that things have not gone back to normal with my uterus after having my daughter. Is it fair for me to ask my doctor for an ultrasound to make sure everything is okay? I brought it up to my doctor(not an obgyn just a regular doctor) and he said it’s not necessary. Has anyone gotten an ultrasound just to make sure everything has gone back to normal after giving birth?