So could Ramzi still be right??

So when I was 6w and 3days I had an ultrasound that showed the start of a baby and the sac. Being so curious as to wonder if the baby would be a boy or girl, I sent in my picture to the ramzi theorist and they predicted boy and sent my picture back with the bottom portion of the sac outlined stating that the placenta would eventually start growing there. But yesterday, at 13w, I just had an ultrasound and the lady said my placenta is right on top of baby. I also thought I seen the nub which looked girly to me. Could the theory be wrong or can the placenta actually move from being on the bottom to the top?? Please let me know..oh and I did the SneakPeek test which came back girl so idk which one to believe really.