At 1604 and 281 there was mommy time but it appears it has closed. The website said someone was offering yoga classes there. With my first I did prenatal yoga at Destination Maternity. At the time their classes were free.
While pregnant with my second I was doing stroller strides/fit 4 mom. Most of the moms there had at least one child but they'd welcome you if you were pregnant with your first. Generally there is at least one or two pregnant moms in class and the instructors will modify exercises if you need it.
I'm sure there are other yoga studios with prenatal classes in the area. You'd just have to call around.
Re: FIT Moms to be..
While pregnant with my second I was doing stroller strides/fit 4 mom. Most of the moms there had at least one child but they'd welcome you if you were pregnant with your first. Generally there is at least one or two pregnant moms in class and the instructors will modify exercises if you need it.
I'm sure there are other yoga studios with prenatal classes in the area. You'd just have to call around.