I too would wait until you actually got the job, otherwise I would always wonder if I didn't get it because I was pg, which I know 'legally' they can't do but will do if they feel it will be too much disruption to the business. If you do get it and then tell them you will be able to gauge if they are going to be aweful to you or not and I would either decline it if you get a horrible vibe from them or take it if you get a good feeling from them.
