Hi talp,
I had foot massage/reflexology once to twice a week (1.5 hours each session) when I was pregnant with my 1st baby. Not just that it helped to avoid having leg cramps and water retention, it also feel sooooo good! I used to go to the place in Central call Happy Foot (next to escalator, 20 yards down from Dublin Jack). My favourite masseur there is "Fong".
As for pre-natal yoga, I highly recommend Robin's class at Yoga Central. She is very experienced and knowledgeable, plus the fact that she was pregnant at the same time as me so she really understand what you are going through.
Good luck with the pregnancy.
Cyndi