E.P.
They have them at Baylor Grapevine in the outpatient physical therapy building. When you call the main number to Baylor, ask for outpatient physical therapy, and then for aquatics. They have prenatal water aerobics and other water aerobic classes.
Also, I go to Lifetime Fitness in Colleyville and I take the water aerobics at 8:45 in the mornings.