I worked for an orthodontist while I was pregnant with my first. It was totally fine. I just didn't really do x-rays while I was pregnant. Once in a while I did but there was a wall that divided me from the machine and my doc. said that was fine. So I still only did them once in a while just to be on the safe side. And yeah no nitrous but it was easy to just have someone else take the pt's that needed stuff like that. I think you will be fine to continue to work there.