Congrats to you two as well! and I also feel depressed when I can't workout. The past few weeks have been hard for me but knowing that the little bugger is doing fine helps me. A big part of the reason I kept up with my workouts was so I could heal faster after the baby comes (planned C-section) and to help me keep up with my 3.75 year old during my pregnancy.
Just remember to listen to your body and modify. I ended up doing pushups off a chair or step so I didn't have to get up quickly off the floor, amazing how fast Cathe moves in some of her workouts and the Low Impact Series is wonderful but very ab oriented so if you feel any weird twinges just try to modify, I stopped using the disks for some of the moves because it was too hard and did things slower by the end.