DC Local law is more generous, all DC emplpoyers are covered - call the DC Human Rights Commission to discuss before bothering with a lawyer.
http://ohr.dc.gov/complaint
§ 1-2505. Discrimination based on pregnancy, childbirth, or related medical conditions.
(a) For the purposes of interpreting this chapter, discrimination on the basis of sex shall include, but not be limited to, discrimination on the basis of pregnancy, childbirth, or related medical conditions.
(b) Women affected by pregnancy, childbirth, or related medical conditions shall be treated the same for all employment-related purposes, including receipt of benefits under fringe benefit programs, as other persons not so affected but similar in their ability or inability to work, and this requirement shall include, but not be limited to, a requirement that an employer must treat an employee temporarily unable to perform the functions of her job because of her pregnancy-related condition in the same manner as it treats other temporarily disabled employees.
(Dec. 13, 1977, D.C. Law 2-38, title I, § 105, as added July 17, 1985, D.C. Law 6-8, § 2, 32 DCR 2959.)