My experience is nothing is advised in the first trimester not even facials or hair colouring I don't - for a number of reasons -smells can make you feel sick and nobody is prepared to take responsiblity so I would say do nothing until you are safely in your second trimester and then most salons will be cool with facials and massages etc etc - good luck and enjoy or pregnancy it goes so quickly!!!!
When you are pregnant you are MUCH more likely to react to things - so best leave it a little while. If you need to do a face pack, porridge oats and yoghurt will cleanse and clarify without the risk. Although you may well feel inclined to eat the mixture.