Just being around pregnant women in college, work, friends etc and seeing how wild that thing is should give you appreciation. My girl recently had a pregnant friend of hers over to our house and I swear she got up and waltzed to the bathroom 5 times an hour, because the baby was just chilling on her bladder.
She was joking about it in good spirits but man...that must be hell. Months of that and then birth which is crazy too, months of recovery and motherhood...man I can't even fathom not doing everything possible to make that ENTIRE process as comfortable as possible for her, whatever it is. You can't control the pain, bladder, cravings, mental state, etc. But you can sure as fukk make sure the house is in order, learn any massage that might help, and make sure she doesn't have to do anything she can't do comfortably...