L.P.
Hi Archana,
There is a wonderful studio called Beloved Yoga www.belovedyoga.com and it is in Reston and Great Falls. Maryam does a beautiful prenatal yoga class. Also, Beloved are organizing a Love Your Body day in Reston Town Center on June 21 (I believe that is the date - pleae check on the Reston Town Center website) where there will be many local area yoga studios togther so you could check them all out and find a schedule that works for you.
Have a wonderful time with your pregnancy and good luck.
L.