My first u/s's were scheduled for 13 weeks. The u/s dr says that sometimes he can tell that early.
For our first, he didn't want to say b/c he wasn't 100% positive, but my hubby pressured him. He said 80% girl. When we went back at 20 weeks, he said boy...and he was a boy.
For our second, at 13 weeks he said 100% boy, confirmed it at 20 weeks, and he was a boy.
I've heard that if they say boy it more than likely is a boy. But if they say girl, it could be wrong as the "parts" may not have been visible in the u/s. IDK.
I guess you'll find out at your next u/s for sure!