Girl or boy? Cant see a nub

[Amandak09]

Hi as you can tell I'm ridiculously impatient. I am so eager to find out if I'm having a boy or a girl I've been looking up theories.The most positive one seems to be the nub theory however I can't seem to see one on ours. This scan as do e at 12 weeks 5 days. Does anyone have any idea on the gender or nub theory

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