I wish I could offer you some advice, but I am currently not working. I am only working for a temp job right now while someone is on maternity leave and then I'm back out of work unless I score something soon. I'm in a different boat. I have a second interview today at a law firm near home and it sounds promising. I just don't know if I'm offered the position if I should tell them that I am pregnant or not. I mean I am only five weeks, so I hate to really TELL them that just yet, but I hate to spring it on them in two months down the road and look like a sneak.
If I were you, why don't you wait to tell them until you're sure what you want to do, and if you're not sure by then, just tell him you cannot plan that far in advance and you will have to wait and see how you adjust to motherhood, etc. before committing to whether you are going to come back or not.