Ramzi theory?? Any guesses?

Jennifer • 27✨Proud mommy of my rainbow baby BOY {Jan 9, 2017} & Angel baby {June 2015} 💗👼🏼💙
I had a scan today and doc measured baby at 9 weeks 3 days. I've heard it's too late for Ramzi theory now. Is that true? I've also heard about the nub theory but have no clue how that one works. Any help is appreciated. I'll attach my ultrasound pic if there's any takers for a gender guess. It's an abdominal ultrasound. :)