Early Pregnancy Detection Matters2 When you may be pregnant, you want to know as soon as possible. In this emotionally charged time, you can count on First Response to give you results in just one minute. Relieve anxiety by knowing for sure, and knowing faster. With over 99% accuracy1, First Response Rapid Results Pregnancy Test uses enhanced technology to isolate and detect the pregnancy hormone in your urine in 1 minute. 1 >99% accurate at detecting typical, pregnancy hormone levels. Note that hormone levels vary. 2 FIRST RESPONSE detects the pregnancy hormone 6 days sooner than the day of your missed period (5 days before the day of expected period).