Like ZF said, you should only see someone who specialises in pregnancy massage and treatments. You'd be best to see a physio IMO. I had a lot of treatment when I was pregnant with my DD but my physio are pre and post natal specialists.

I recently had a pamper session at a pregnancy day spa which was divine (I had a one hour full body massage followed by a facial) but they are fully set up for it and trained in the field. The beds are specifically designed for pregnant women as are the products.