The less stress you impose on a gravid BP, the better. Gently moving a gravid female for cleaning/maintenance/ultrasound is one thing. Holding her just because you want to is another. Maybe I'm influenced by the female perspective on this, but it's always a good thing to make pregnant females - regardless of species - as comfortable as possible, and that means reducing interaction to "only what is absolutely necessary" in my book.

Just my $.02...

K~