I went to swim aerobics at Gold Creek in Woodinville. It was me, one other pregnant lady and a bunch of elderly folks who fawned over us two : ) I loved it, had a good time and got a good workout.
Talk to the folks at Ashram Yoga in Kirkland. They have a "bar yoga" class that uses a ballet bar and some yoga poses. It's supposed to be excellent for both a pre and post-natal workout.
Re: Eastside- Recommend Prenatal Yoga And Aqua fit classes pls