Not sure if this has happened to anyone

I have a problem with antibodies. So for the past couple months I've been getting an ultrasound then app with my OB every two weeks. Well my last visit my OB said I'll see you in two weeks then I went to book my next ultrasound and app at the desk and the receptionist said he never ordered an ultrasound and only booked the appointment. She said she can't so anything (like ask him??) and to call back to figure it out which I've been trying to don for the last week but the office is on vacation. Not too sure what I should do but I was under the impression that antibiodies are more dangerous the further along you get... So I don't understand why we would stop ultrasounds now. I'm 35 weeks but the ultrasound would be at 36 weeks. Should also mention that the antibiodies have remained stable