Possible to still have a boy?

Ch

I had my 13 week ultrasound yesterday and the doctor told us he is 70% sure it’s a girl. Has anyone experienced the doctor not seeing what he thinks is a boy but ends up being a girl? My husband really wants a boy and he’s holding onto hope. 😅 it’s fine either way but I want to know if there’s even a chance at 13 weeks that boy genitals aren’t obvious yet?