Know It's a boy but is that his....

Had a blood test done so we know he's a boy. I wasn't supposed to have a US at 16 w but my doc was trying out a new machine so I got to see my little guy in return for her trying it out on the phone with the rep (I was thrilled haha). Videoed it and didn't notice till after that while he's doing the running man, something. Is sticking out from between his legs the whole time. I marked his legs in red... Do you guys think the blue arrow is pointing to his penis? Just speculating!