Hi TinyToes, the ladies here are right. I'm a qualified beauty therapist and we are not able to carry out full body treatments on anyone in their first trimester. A facial should be fine but make sure that the products being used do not contain essential oils as some are not advised during this time (e.g. Rose, Marjoram, Clary Sage). Another option would be a luxury manicure maybe with a heated mask? Sometimes I find getting my nails done the more relaxing thing!
Hope you have a lovely time away!