Usually 8-10 weeks for dating. Some won't have one at all until 18-20 weeks. It all depends on your doctor.
With my 2 pregnancies on my first visit they did a vaginal ultrasound, but I won't get my other one until I'm 19 weeks. Does that help?
I guess it all depends if you are high risk or not. I'm high risk and got my first ultrasound at 7 weeks. I get an ultrasound every 2 weeks through out my pregnancy.
The initial scan can be done up to 12 wks for dating...depends on the carevset up u have ur based
In the uk we have our first ultrasound at 12 weeks.
I had mine at 8 weeks but I am high risk but usually they do one for dating. I've had 3 so far and I'm almost 15 weeks so it depends on your dr. I know if your high risk you will have more then a normal pregnancy.