Quoting melfang:" theres always a chance that they are wrong, my friend had 2 ultrasounds and was told both times that ... [snip!] ... was a girl and when the baby came it was a boy. thats why i never buy anything gender specific until the baby actually comes. "
They told me at 14 weeks I was having a boy, and then another technician told me I was having a girl when I was 18 weeks and then at 20 weeks again another tech told me it was a girl. I will do the 4d when i am little further along just to make sure.