In my case, yes the sonographer was 70% certain we were having a boy. This was confirmed at the 20 week scan and also when I had a scan at 29 weeks. Some other ladies here also had the sex of the bubs told at the first scan and they have also been confirmed correct at later scans.

All three of us went to the same ultrasound place so it may be the advanced equipment or that they know what they are looking at and can tell.

Best wishes for your pregnancy.