Totally clueless about all these gender theories! Please help!

First—so sorry this is a repost from the other day. I meant to delete a comment I made with a typo, but I stupidly deleted the post instead because I wasn’t paying attention. Anyway! I’m team green, so at my baby shower people are making guesses about what this baby is gonna be. My friends are competitive even though the only prize is getting to say they’re right 😂 I told them I’d try out the old wive’s things like the ring test and let them have that info before they guessed. But I don’t know anything about skull or nub theory or whatever. Pretty sure you can’t even see a nub in my photos. But I’ll post it here in case anyone wants to have a prediction I can pass along. I have no real intuition so I’ve been pretty useless in this area! I’ve got several scans due to getting the NT scan and an extra one for bleeding.

20 weeks:

15 weeks:

12.5 weeks:

9 weeks: (baby was on my right side for orientation reference):

Thank you so so much!!