Worried about wrong gender.

Ka

I went in for an elective ultrasound at 13 weeks. The lady said she was 100% sure it was a boy. However, she never got a true potty shot between the legs. I am so nervous now that my 20 week scan is next week that she was wrong. I went out and bought a bunch of boy stuff, told our families it was a boy, finished the nursery...and now I'm worried after seeing peoples ultrasounds of their girls that it might be a girl. My husband has been so excited about having a boy and I have even come to think of the baby as a boy and we've given him a name. We are first time parents so I know we should have waited to confirm but we've just been too excited. I have also just felt since the beginning that its a boy and so does everyone else. 

Here are the pics from the ultrasound at 13 weeks. What do you think?? The first pic definitely looks like a weeiner and ballsack to me, but the 2nd one looks like it could be a vagina. 😫 I wish the lady had never told us she was 100% confident!