Women's/Worker's rights in China?

I have two questions:
1. My husband is applying for a work visa, sponsored by his employer in Shanghai. I will follow as his spouse, but can his employer decide not to sponsor me, just because I'm pregnant? Or, can they drop him?

2. I am looking for employment and understand any company that offers me employment would have to convert my visa into a work Z, but, can they legally deny me employment based on my being pregnant? I know that's a question on the visa application questionnaire. To protect myself, I would inform them of my situation once a job offer is made but I'm afraid, even then, they would drop me.