Yoga Works in WC has classes as does The Yoga and Movement Center (also WC) however I prefered the classes at the YMCA (PH). It wasn't prenatal but the teacher is certified in prenatal and would give me specific modifications. Plus I paid less for a membership there that included pool access and yoga 2x a week that doing just yoga at the other places. Good luck finding a class you like, and welcome to the board/Concord.
Day One center in Walnut Creek offers classes twice a week (Wednesdays evenings and Saturday mornings). Destination Maternity also has class once a week - they are partnered through John Muir Health but anyone can go.
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Re: prenatal yoga in Concord area?
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Harmony Doula