“Today I will know for certain if my life is changed, if the tiles underfoot seem cool simply because of the August heat.” With abbreviated names and unprefaced intimacy, Christine Lehner’s Expecting chronicles the comic, tender, occasionally ominous events between a young woman’s first pregnancy test and the celebration of her baby’s birth. C’s dreams, vivid with images of Central American coups, sea journeys, homes crowded with foreign guests, seem not only to reflect, but also to prophesy.…