If you can go for a place that does Maternity Massages, they are AMAZING and very relaxing, i had a couple while PG. (mine had a maternity massage chair as opposed to a bed)

I think they suggest NOT getting massages as your putting a lot of pressure on your belly if your lying flat on the table and also there are certain pressure points that later on can bring on labour etc.

Check out your local massage parlours or day spas and they will let you know whats ok.. i would go for a decent one though instead of say a little one in the middle of the shopping centre IYKWIM.

Enjoy your massage when and if you get one HTH