First Response Pregnancy Test Single

First Response Pregnancy Test Single. The first few weeks of pregnancy are critical to fetal development, so early prenatal care is important for a healthy birth weight and the baby’s survival. The sooner you know you’re pregnant, the sooner you can begin making healthy pregnancy choices for yourself and your baby that include diet, nutrition and limiting your exposure to hazards.. 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 the pregnancy progresses.. In laboratory testing, FIRST RESPONSE™ detected the pregnancy hormone levels in 76% of pregnant women, 5 days before their expected period; in 96% of pregnant women, 4 days before their expected period; in >99% 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.