Found out at 15 weeks, 5 days. That's when my dr checks. It was accurate for me. Got it confirmed at 20 weeks, 31 weeks and at birth :)
I found out today at 17+3 a very clear boy
I found out at 15w3d. Confirmed at 18w
I found out when I was 18 weeks . Some find out earlier but it's more accurate 16 weeks and up