A clear girl nub.. is he definitely a boy?!😯

When I posted my first scan everyone on here said girl based on nub. I looked up the nub theory myself and it definitely was a girl nub. I was hoping for a boy but convinced myself it was a girl. Then at my gender scan at 16w3d I was told it's a boy which was definitely a shock but couldn't have been happier. Now I have my 20 weeks scan in 3 days and really nervous incase they got it wrong. I posted the one with the girl nub and the gender shot underneath. Wanna ask one more time.. Would you say it's definitely a boy? So nervous I've already bought some really cute stuff too!