Dear Neha,
In Philippine setting, and I believe even other countries the basic principles of employment system (not to mentioned "Generally Accepted Principles") regardless of the stipulated substance of contract neither written nor implied and or the employment status quo. The Labor Standard (Government Implementing Guidelines) were created for the benefits of the employees (Maternity, Accident, wages, and all other fringe benefits) neither stated or not stated.
EMPLOYMENT CONTRACT by definition is an instrument of convergence favorable stake by the employer and does not always follow the settlement not unless it is substantiated by the provisions in accordance with the sovereign law. Example, even if your maternity benefits does no stipulated in the contract and even if you have had agreed the terms, the labor law trends may impose pre-emtive measures voidable in favor to you.
You should always remember the principles of employment system shall always undertake in the prism of tripartition.
Regards,
Vlademir