Vaginal ultrasound

I've heard that vaginal ultrasounds can cause miscarriage. There's a sufficient amount of evidence online as well, although doctors claim it's safe, many woman have miscarried within hours of having one. I have my first doc appt at 8 weeks and I'm currently thinking of rescheduling until I'm 10 weeks, to be on the safe side ad do a regular ultra sound. Just curious what everyone's thoughts are on vaginal ultrasound.