I was going through the same situation, so I asked my father - in - law who is a labor lawyer. He told me that study after study shows that employers will 95% of the time hire you anyway if you tell them up front. You shouldn't, however, tell them as soon as you walk in the door. Wait until it starts to look like you are going to get an offer. If they want you, they will still want you even if you are pregnant. He said if you do not tell, you are starting off the job having misled them, and they are going to feel like you deceived them. They will not like that very much. One thing I didn't know is that if you haven't been there at least a year, they are not required to give you the same job when you return from maternity leave. They can have you scrubbing toilets, and they may not be inclined to give you the same job if they feel like you hav mislead them. Ultimately it is your decision, but I would tell. I hope that helps.