Hi Yarrawin, long as you've got a good chiro and you let them know you're pg it's no problem.
I have fortnightly visits to my chiro, chiropractic care can be a great help through out pregnancy, if everything is kept in alignment you can even have shorter labour times and will definitely help you if you're having pain with your neck now I'd get it sorted early and maintain the visits then to keep everything good.
My chiro has special cushions to accommodate my growing bump so laying on the bed is no drama either.

Congratulations on your pg and good luck with the massage and chiro