Bearfrills Tue 15-May-18 20:08:44

With DS2 my 12wk scan was done by the lead sonographer so she knew her stuff, I was measuring 13+4. We got a very good view of the 'nub' and I joked "it's a boy!" because it was a nub that was sticking right up. The sonographer went back for another look, studied it a bit from a few angles, and then agreed with me that it quite probably was a boy. Apparently nub sticking up is around 70% likely a boy and nub pointing down is around 70% chance a girl as it can indicate whether it's on it's way to developing into a penis/testicles or vulva/vagina. She did stress though that this is nowhere near as accurate as sexing a pregnancy at 20+ weeks and not to rush out and buy any "it's a boy" banners. She did mark in my notes that she'd gotten a good look, that we wanted to know the sex at the 20wk scan, and that she thought it was a boy. She ended up doing the 20wk scan too and we had an "aha!" moment when he was definitely a boy.