[Superman]

State employment discrimination laws usually (probably always) focus on protected groups like race, gender and religion. This discrimination is a human rights violation and is serious but sometimes challenging to factually establish.

"Pregnant" is not one of those groups.

That said, a consultation with a legal expert is a very good idea. Since your goal is to negotiation separation terms and not litigation, you may be able to get some traction.

Congrats on the upcoming family member arrival. First child? Fasten your seat belt. This is going to be the highest impact experience of your life by far. Looking into the face of your child is so powerful as to be near unbearable. Like looking into the Sun. Parenthood is an experience that ONLY another parent can understand. It's also a good movie.