I know, Im going to stop nub sessing now!! We def wont find out at anatomy scan, DH really doesnt want to and we didnt for any of the others, so I just have to put it out of my mind!
Its def the white line, as I also had another quick scan at work when I was 14 weeks and it was still there looking very flat still. That more grey thing is cord. I also put it on in gender and coldwater pointed out the cord on top of the nub.
Ok, I wil TRY to put it at the back of my mind now.... haha