I agree with being honest about it.....you would feel MUCH better in the end. I did that one time (hid it and told them after they hired me) and I felt horrible. The thing is, THEY knew it too so it made me feel very awkward every time I went to work. You certainly don't need that additional stress....so honesty is better! But I would let them know too that you generally have healthy pregnancies and that you wish to work xxx amount of days up to the time of delivery and you plan on coming back xxx amount of days because they may admire that about you too

I'm not well versed on who may hire you....but it IS tough for a pregnant woman to find work and that stinks

What did you do before? What are your qualifications? How often do you want to work? (full time, part time?)