What a difference a day makes...or does it? Church and Dwight, Co., Inc. recently announced that their First Response Early Result Pregnancy Test can be used up to six days before a missed period. For want-to-be mamas who are anxious to find out if they are with child, it's exciting news. Some ladies track their cycles while others are a bit more lax about the childbearing process. There are even women who never realize they are expecting until baby makes its debut. How long was it until you figured it out?