When should I do my dating ultrasound?

I want at least the fetal pole to be there, heart beat and able to see the "little gummy bear" that will be my baby. I don't want to get my dating ultrasound done so early that I only see a sac.. That would just worry me. So about how many weeks should I be to do my dating ultrasound? I've had a miscarriage and not seeing a heart beat would just make me a nervous wreck. 
I am asking because my DR does the scan my very first appointment & I am only 2-3 weeks right now. 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors