When I first read this, I didn't respond because I don't talk pregnancy much anymore (although my DIL is pregnant with my second grandchild!). Anyway, if I were going to buy a new bike to ride while pregnant, I might get something more practical for the impending lifestyle change than a mountain bike. A hybrid or commuter bike with a much more upright and comfortable position--for attaching the baby trailer to later, places for racks, fenders, etc.--might be a better option.
My DIL still rides her Raleigh mixte a little, with my grandson in the trailer, although she's high risk and doesn't take any chances. I see you're quite the competitor and probably can't imagine going from a Farrari to a mini-van! But in practical terms, the hybrid/commuter/utility bike looks like a better choice to me in the long term.
Congratulations on the baby!
Karen
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insidious ungovernable cardboard