The Act, which goes into effect on April 1, 2018, expressly prohibits employment discrimination on the basis of pregnancy and pregnancy-related conditions. The Pregnant Workers Fairness Act, effective April 1, 2018, prohibits employment discrimination on the basis of pregnancy and pregnancy-related conditions.The Act expressly forbids discrimination against employees due to pregnancy or pregnancyrelated conditions, including nursing. Pregnancy discrimination is against the law. Both federal and state laws provide protections against pregnancy and pregnancyrelated discrimination in Massachusetts employment situations. These protections require employers to treat pregnant workers similarly to nonpregnant workers. This document provides guidance regarding the Pregnancy Discrimination Act and the Americans with Disabilities Act as they apply to pregnant workers. This state-specific guide covers labor and employment case law, statutes, rules, and regulations that HR professionals and clients often encounter Discrimination on the grounds of pregnancy is a type of sex discrimination at work under both Massachusetts law and federal law. If you are working and pregnant or planning a family, you need to know your rights under the Massachusetts Maternity.