I also have a pregnant girlfriend, she also changed some opinions regarding my BP's.
Mainly the fact that there is a chance of some snakes not accepting frozen mice and therefor I cannot expand
My experience is that when their mind is set you can better leave it alone unless you want to have problems at home
My plan is to get back on the subject when the hormone levels get back to "normal".
Because I AM getting my collection so I can become a breeder, even if I need to create a place for my snakes somewhere else then my own home.
So basically never give up your own point of view, but know when to fight your battles!