Hi this is my first post so please forgive me if this is a silly question or this thread already exists (if so please point me in it’s direction)
I love looking at everyone’s scans and seeing all the guesses but I don’t actually know what the nub theory is... stupid I know. I have googled but still can’t understand it especially when trying to relate it to my own scan pics I don’t know what I’m looking at! (scan done at exactly 13 weeks)
Please can someone explain the nub theory to me ?? 😂