Should have filed with the office of disability services (or access services or whatever they call it) for accommodations.

Without that there's no lawsuit.

Pregnancy is a protected class.

Edit: not sure about Germany

Not sure about Germany either.

But in the US, colleges have offices for accommodations. The faculty isn't required to do anything unless the university, acting through that office, tells them to.

Source: my career spent working with this kind of institution and this kind of office.