With my first we didn't find out, with my second the sonographer showed me her parts so it was easy to see nothing was there. This baby was uncooperative and was facing my back... wouldn't turn even with changing position, eating sugar, and shaking my belly. So when she showed me the screen and said she wasn't sure it's making me wonder. The image was zoomed out and a view of baby's bum... so I couldn't see any outline of the area at all...