M.,
It's L. again...I wrote another response and it's not showing up yet.
Anyway, not sure where your job is located now but the North Dallas location has a Wednesday class at 12:15 which you might be able to work in your schedule if you are out this way. Otherwise...
Here's a listing of all the places in DFW that offer the Mamaste yoga I took while pregnant (and mommy and me now). I was at the north Dallas location but some of the others might be a little better for you.
http://www.mamasteyoga.com/schedule_tx.htm
I would not reccommend starting a regular yoga class now as you are nearing your last trimester, esp since you haven't been going. I love my regular yoga studio, but their advice for pregnant women wasn't too great. Better safe than sorry!
If none of these works I have the routine sheets on my PC at home that I can email you and you can practice from at home.
See you soon :)