Mary was engaged to Joseph and he had not been intimate with her. Forthree months Mary stayed with her cousin Elizabeth (to whom John the Baptist would be born) and when she returned her pregnancy began to show. Joseph not understanding what had taken place, was naturally disturbed, and considered whether he should divorce her. Matthew 1:18-25, Isaiah 7:13-14 (732 B.C.), Isaiah 49:1, 5 (712 B.C.).