6 Days Sooner Than Your Missed PeriodOver 99% Accurate on the Day of Your Expected Period* First Response™ detects the pregnancy hormone 6 days sooner than the day of your missed period (5 days before day of expected period). Things to know about testing early...some pregnant women may not have detectable amounts of the pregnancy hormone in their urine on the day they use the test. The amount of pregnancy hormone increases as pregnancy progresses. In laboratory testing, First Response™ detected the pregnancy hormone levels in 60% of pregnant women 5 days before their expected period, in 86% of pregnant women 4 days before their expected period, in 96% of pregnant women 3 days before their expected period, in 99% of pregnant women 2 days before their expected period, in >99% of pregnant women 1 day before their expected period and in >99% of pregnant women on the day of their expected period. *>99% accurate at detecting typical pregnancy hormone levels. Note that hormone levels may vary. See insert.