gender scan confusion

K
Hi just looking on opinions weather I should book for a private scan. 
I had my 20 week scan 4 days ago and the lady doing the scan said she's 80% sure my baby is a GIRL 💖 well today I've been looking at my scan picture smiling at them as you do and I noticed this that I've circled in red what is it?? Baby isn't sat with legs open so I don't know help please What do you girls think thanks