It's a girl, but what's this?

I see the three white lines, but I see a little, very faint sideways 'y' with the middle line in the middle of it. I see the sideways 'y' on some girl potty shots, but usually it's part of the three lines and not in addition? Any ideas what I'm looking at? It just has me confused.

Thank you for any insight you can provide!

Attachment 20331

Gestation - between 18w and 19w

That's the classic 3 lines shot!

All girl!

The y you are referring to with the arrow is just the perianal area just the folds of skin still moving around. Nothing really in "addition" to she just happened to be moving when they got that shot :) No worries all normal! Congrats on your girl!