D.B.
I'm glad you came to vent. I agree with Geneva about the last month of pregnancy being a complete waste of time! Of course, I think the real reason for those breathing exercises is to work your lungs enough that you can toss out the Lamaze and yell "Epidural!" at the top of your lungs!
Look, take the time if you need it. I know you're trying to save it for after the birth, but maybe you need it now. Send your kid to school, call in sick, and go back to bed for the day. Really. Please look at your to-do list for the day and cross of 25% of it. Stuff doesn't need to get done. It's okay to have cereal for dinner, leave beds unmade, leave your older kid's clothes on the floor, and so on. Just do it. None of us will tell anyone!