Beaumont has water aerobics at the Beverly Hills club on Southfield Road. I think they also have a couple other classes, (maybe yoga?) you can find what they have on their website.
The Beaumont Water Aerobics class is a nice one. There are also a few GREAT yoga classes in Royal Oak, but there is a better yoga class in Troy on Saturday mornings, for much less money, and with an instructor who is just plain awesome. There are non-pregnant women there, but the instructor has a ton of training in adjusting poses for pregnant women. Several of my clients attend, and love it. I really enjoy the class, as well.
Not sure if you have a Fitness USA membership or not, but if you do, they have water aerobics classes there. I'm going to start mine this week I think. Just have to find a bathing suit now.
I take the Beaumont one at the BHC. I really like it, especially now that I am getting bigger and more uncomfortable. If you are not a member of the BHC (I am not), it's $115-ish for 6 weeks, twice a week. You can choose MW or T Th. They are really flexible if you need to do makeups or come to a different class.
Re: Prenatal exercise classes?
Not sure if you have a Fitness USA membership or not, but if you do, they have water aerobics classes there. I'm going to start mine this week I think. Just have to find a bathing suit now.
Good luck!