One off ultrasound scan without my gynae

Hellooo! So.. I had my scan done on my lmp 7wks but ultrasound showed 5w2days in kkh, and I'm really worried because the size also was quite small and cannot see the fetal pole. The next appt they could schedule for me is 7 WEEKS after my first scan! Because of my gynae's availability... Is there any way I can book for a scan separately without having to do a consultation with my gynae and being tied to her availability? So I can do it earlier.