Please help, confused and can't decide who is right?

3 Attachment(s)

Hi all

I can't work out which is the right way to look at the nub. This was taken when baby was 13 weeks + 4. My SIL thinks it looks like a girl (so did I originally) and says she has rarely been wrong and guessed her babies and her friends correctly. However when I posted on my birthclub on baby centre all replies said boy! I just want to know what you guys think and what your opinion is as it's totally driving me mad. Any expert eyes and replies are greatly appreciated :)

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I do not see a nub

I don't see a nub either and I don't think what you have a top red line on is the nub.

yep no nub. They had the angle just right to hide it!

That's not the nub!