When you request a leave or an accommodation, do so in writing, explaining the reason for leave and how long a leave you need. Keep copies of everything you send and receive from your employer, as well as copies of doctor's notes and any other medical documentation. If you continue to be denied leave, you may want to file a grievance. If you are a union member, you may be able to file a formal grievance through the union. Try to get a shop steward or other union official to help you work through the grievance process. Some employers have policies for handling a dispute regarding leaves. You may be able to resolve the dispute at your job internally. Find out what the policies are, by looking in your employee manual or other sources of personnel policies. Your company's human resources department may be able to help. If you are being discriminated against and want to file suit, you must be able to produce evidence that a similarly situated worker was treated differently or more favorably than the pregnant worker to establish a prima facie case of discrimination. Once this is done the employer must demonstrate they had an articulable reason for treating the pregnant worker differently. If the employer satisfies that burden, then you have a chance to demonstrate that the articulable reason they gave is merely a pretext for discrimination, and was not the real reason for the employer's action.