Went for an ultrasound, they said it's a frozen embryo and the yellow …

Went for an ultrasound, they said it's a frozen embryo and the yellow body is not visualized. I don't trust this ultrasound and the doctor, especially because on Friday everything was fine, the yellow body was good, a plump egg was smooth, nothing bothered me over the weekend. In general, I left the hospital quietly, a private clinic arrives, I registered there for an ultrasound, but there's another problem that even with money, I can't go anywhere else.