Stressing about gender

Hubby has an almost 12yo daughter and I am currently 7w1d. We won't find out our baby's gender for at least a few months and I haven't had an US yet to try the Ramzi theory. I told him about the Ramzi theory and he is interested to test it out. Is it valid after 6 weeks?

Also, he says he wanted stepdaughter (SD) to be a boy originally but was happier that she was a girl because they are "sweet" and "cute" and not rowdy like boys. However, his family name won't survive if neither he nor his younger brother have a son. I feel like this is the only major reason he'd want a son.

Ok, I KNOW he'll love our baby so so so much because he loves me and is excited to have our own family- his ex was very horrible to him. And last night when he prayed for us, he just asked God for a healthy baby, but we'd both prefer a girl if possible. I know baby is already either or but I can't help but think he'll be slightly disappointed at first if it's a boy.

Hubby is a mechanic and a "man's man" so I know our boy would be loved and well taken care of and I'd love to have a son if that's what baby is. But hubby keeps calling baby his "little girl" and calling it by the girl name we picked out, Kendall or Meadow. Am I being irrational?