Thanks for the feedback. I think it's nice to tell them, as a courtesy, and because the child will probably want to talkabout it at some point, with other children or teachers.
I did tell the owner and two teachers yesterday afternoon. They were all surprised (really though it was obvious but maybe not), but the owner said she was about to ask me what was going on as I ''looked different', and my breasts were huge ( we have that kind of relationship). We had a nice chat abt pregnancy afterwards too. I feel better that It's out in the open now. I haven't told the other two teachers I'm less close to, and don't plan to. I guess the other teachers might mention it.