Hello, could you please tell me if it's possible to determine the exac…

Hello, could you please tell me if it's possible to determine the exact sex of the baby at 10 weeks and 6 days? I had a first ultrasound with a very good sonographer, she suspects it's a girl, in our city the best specialist in her field, but still said that she might be wrong, even showed something like a clitoris ?, and yet I want a boy ?