prenatal exercise

gremxul

Does anyone know of a good place for pre-natal exercise (yoga, pilates, whatever) in the northern Philly suburbs?  I figured Abington/jenkintown/flourtown would have something, but man I am having trouble finding anything that is on the evenings or weekends.  This was so much easier in the other places I lived.  I feel like there is a huge market - where are these places???  Thanks!