I Don't Get It

So I went to an ultrasound and they also did a 4d ultrasound today and the tech said my babys in position already , but with the pictures we got she looks like shes laying straight across I don't get it , is that just how it comes out ? Because she put the thingy on the bottom of my belly and said her head is down there and that her legs are below my breasts lol 
Can someone please explain to me ?