Twins, Is B a boy or girl?!

Kati • Im Kati and Im expecting twins on June 18th, 2016 💜
Im 12 weeks and 2 days today, I had an ultrasound and this is a picture of Baby A. Baby B is the one on top, he/she was in a wierd position and really wanted to be difficult haha. We cant tell if thats Baby B's head or butt, but pretty sure its the rump. If it is do yall think its a boy or girl? So many people are saying so many different things. To me it looks like a boy but mayne not. What do yall think?