Many of us are familiar with the English wedding rhyme that describes what a bride should wear on her wedding day for good luck: Something old, Something new, Something borrowed, Something blue, And a silver sixpence in her shoe. As cohabitation before marriage continues to rise, now, more than ever, a bride’s something new may be her pregnancy. In fact, nearly 20 percent of women experience a pregnancy in the first year of their premarital cohabitation. Under Illinois law, parties must freely …