Pregnancy Discrimination Amendment Act This bill amends provisions of the Civil Rights Act of 1964 that protect against pregnancy discrimination in the workplace to provide for women affected by pregnancy, childbirth, or related medical conditions to be treated the same for all employment-related purposes as any other persons who are applicants for employment with, or employees of, the same employer in work that is performed under similar working conditions and who are not so affected but are similar in their temporary ability or inability to work. The bill makes such treatment applicable to existing prohibited categories of employment discrimination on the basis of sex or because of sex.