Nub theory - would really appreciate your help!

S🌷 • Mummy to my handsome son and beautiful daughter 🐻🦄
This was baby at 13 weeks, I'm 16 weeks now and have another 4 before we find out the sex! Can anyone give me a guess at what baby will be from this pic, maybe based on the nub theory? Would really appreciate your view! :) thanks!