I found this information in an article posted over on 2nd tri. This organization provides free advice to people who feel they may have been discriminated over a pregnancy or other family related issue. I have seen far too many posts on this board of women being possibly discriminated against - so here's a free, no-strings-attached method to find out what your rights and legal actions are.
Here's the website: www.worklifelaw.org
And their free hotline: 800-981-9495