How accurate is nub theory at 10+4 weeks?

Hi All, I am so happy to be pregnant with baby number 3 after having a miscarriage in February this year but today I went for an ultrasound at 10+4 weeks and saw what looks to me like a really girly nub. I have been hoping for blue after having done a really good sway and already having 2 girls. Can people tell me please how accurate nub theory is at 10+4 weeks? Or even skull theory?
Has anyone had a nub like this and then it turned out to be a boy or am I out?

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Not accurate at all at this gestation. Between 12+2 and 14 is ideal :wink:

Not accurate at all!! You have every chance it could be a baby boy 😊

It is not at all accurate, all babies look like girls at that stage. Y chromosome is dormant and boy parts don't start to develop till the Y chromosome "wakes up" and starts making testosterone, which is just about to start happening.