I had a scan done at 16 weeks and was told I was having a girl, but when I went for my anatomy scan I found out it was actually a little boy.
I was a little disappointed at first b/c I wanted a girl and was already told I was having a girl, but once it set in I got excited to have another boy. However, I still have moments where I wonder/worry that maybe it actually is a girl. Even though it's pretty obvious a boy, lol.
Here's my u/s pic if you want to compare.