At first I was certain now I need reassurance... 100% sure a boy?

I don’t know why I’m doubting it now! But a small part of me is like “what if that’s actually the cord and everything boy related you’re buying will be useless cause it’s actually a girl?” I just don’t want to be surprised at birth thinking it was something different than it was and preparing for that.... boy for sure?? Or...? We don’t plan on having another ultrasound before birth but if there’s enough speculation I’ll schedule another.