Nc labor laws termination surrounding pregnancy?

Recently a friend had a pregnancy scare(turns out she wasn't). The employer a church based daycare found out and threatened to fire her if she were to get pregnant. She's unmarried and signed a "morality clause" upon being hired. While I don't have the exact language of the "morality clause", my question is does it supersede state (NC) and federal laws? If it doesn't do the state (NC) and federal laws protect her from being fired for being unmarried and pregnant at a church based business?