Early Sign Pregnancy Test Strips Early Sign Pregnancy Test Strips are over 99% accurate & can be used as early as the first day you miss your period. They are designed to detect a very small amount of the pregnancy hormine h CG (human Chronic Gonadotropin) in the urine, a hormone that is produced soon after conception & progressively increases in quantity during the first three months of pregnancy. Early Sign Pregnancy Test Strips provide results in just 3 minutes.