So Confused

Ka

How are people already finding out gender through ultrasound? I’ve seen a number of posts where people are less than 14 weeks and they’ve already found out. When I had my son in 2017, everything I saw then was that under 14 weeks was impossible to tell via ultrasound, and that 14-16 weeks often was inaccurate. Are the techs just guessing for all these people, or has technology improved a lot in the last year or two?