For years, a widely held assumption was that women of childbearing age fell neatly into two camps: those trying to have children, and those not trying to have children. A new nationwide study suggests, however, that nearly a fourth of women consider themselves "OK either way" about getting pregnant -- a wide swath of ambivalence that surprised researchers, and that could reshape how doctors approach many aspects of women's health care. The results surprised researchers, and could reshape how doctors approach women's health care.