Try Lauren with Emerging Birth. She teaches classes in Orange and Long beach. She used to teach in Huntington, but now I will go to Orange to take classes with her. She is also a doula if you are interested. I don't have the number down, but you can google it and she will pop up.
I really like Yoga Works because they have several studios and you can buy a package of classes and use them anywhere. They have lots of classes. I do the theraputic ones, in place of prenatal so that I have more classes available to me.
Re: prenatal yoga
Try Unfold Yoga - they specialize in prenatal yoga. www.UnfoldYogaOC.com
Also, check out Jabulani Yoga www.jabulaniyoga.com/