My ultrasound technician told me that there was a 70% chance of baby being a girl but...

A bit of background, he seemed very knowledgeable and he was teaching a student during the anatomy scan (we also were interrupted quite a few times by other staff asking for his opinion on things so he seemed in charge etc).

I told him I would like to know the baby's sex and he waited until the end (so I couldn't see it for myself to double check) and said "there's a 70% chance that your baby is a little girl, congratulations" which I was thrilled about as my gut had been telling me the same.

But as I've kept the sex to myself so it's a surprise, everyone who sees my bump seems adamant that I'm having a boy. It's got me second guessing myself basically.

What do you all think?