Ultrasound

Miranda

So I go for a check up every 4 weeks and the doctor told me I could find out the sex at 18 weeks. My next appointment is the 28th of this month I’ll be 17 weeks and some odd days. Do you think if I call and ask if they push my appointment back if they’ll be able to do the anatomy ultrasound and I could find out then? Or do I have to go to every check up and just wait?