I am 5 month PG and just got a teaching job. I was wondering when do I need to tell them that I am PG? I have never had to do this and I am not sure about what the time line is for any of this.

I don't believe there is a time limit but after a while it will apparently become obvious. Congratulations.

There's no legally proscribed time line - you tell them whenever you're comfortable doing so. As Betty says, there will come a time when it is no longer necessary to tell them; they'll know. ;)

Congratulations.