If you have to ask, refer her to a therapist with the required training and perhaps look into training, its worth it for the level of confidence. Most good training will at least touch on considerations during pregnancy and in the 34th week it is HIGHLY unlikely that you can affect a pregnancy so firmly established but you may not be aware of the questions you need to ask the client if you are not familiar with the issues involved, which may be as simple as how you support your client on the bed. Courses geared specifically give you insights and skills that will be appreciated by your clients