Question about Ramzi Theory/Reading Ultrasounds

Jenny

Mine was a transvaginal ultrasound and I read up on the Ramzi Theory. From what I understood, mine reads "girl", but from looking at others people's, now I'm thinking "boy"?

My question is, the round circle above baby - isn't that the yolk sac? Where is the placenta? (Sorry if I sound like an idiot. Newbie, here. Haha)