My Dr checks at 16 weeks. Ask your dr
I had to wait till I was 20 weeks.
I didn't get a definite answer till 32 weeks because of how she was positioned. Stubborn child I have lol
I got one at 18 weeks. I had to go into a clinic tho because the hospital here doesn't do them until 26 weeks. A lot of the times I think it depends on your OB/GYN and what other places around you offer.