Wrong Gender At Screening?

Ts
Has anyone ever had the doctor or sonographer tell them a gender and it turned out to be wrong? I'm just curious. I had my gender screening at 20 weeks and tomorrow (30 weeks), I'll be going in for another scan. I've had family send me girl stuff and wondered what we'd do with it if it actually turned out to be a boy! Haha. My hubby is adamant that the sonographer is correct and that he saw the vagina. But, I told him, "that could also be a swollen penis!" 😄 No matter what, though, I still love this baby. But, it'd be super fun to have a girl!