Wambui started practicing hatha yoga in 1995, moving onto Ashtanga Yoga in 2008, later taken a great interest in pregnancy yoga. She has assisted Petri Räisänen for many years.
How you should modify you asana practice when pregnant is obviously a very personal thing, but it certainly helps to hear how other people balanced the two. Here is a a short Interview with Wambui Njuguna on her experience of pregnancy and yoga.