Skull theory boy or girl?

Here is a sonogram of my baby at 12 weeks 5 days (measuring a bit ahead that's why It says 13 weeks 2 days). I'm positive about the conception date since it was the only day out of the month we were intimate 😂 Anyway I don't know much about the skull theory it sucks the sonogram cuts off a bit at the top of the head. Will have another sonogram at day 31 to FINALLY determine gender :)