Gender guesses

[Maaahi]

Nub theory. 12+4 weeks. Any guesses please…

I’m currently a few weeks off our 20 week gender scan and so intrigued to find out the sex! This scan was from 12+ 2 weeks- no one seems to have an idea “nub theory” wise but I thought it was quite a good photo for it- am I wrong in thinking the little line on the left towards the rump in top pic is the nub?? Thanks in advance!