Tough decision, and one which you might need to make based on where you see the job going long term.

If (for example) they're going to feel tricked and trapped, and behave badly, is the workplace going to be a crummy plane later? And are you planning on going back after this baby? How will they be then?

Are you confident that you will be prepared to fight for your rights and demand equal treatment etc ongoingly - or will it be a source of stress, disappointment, etc, and cause you unnecessary stress and pain at a time that should be happy and calm?

Or are they going to be professional and treat you like any other pregnant employee?

Or are you unsure about whether you will go back to work, after this precious bundle arrives?

Big decision. Take your time deciding.