A Pregnancy Kit attempts to determine whether a woman is pregnant. Markers that indicate are found in urine and blood, and pregnancy tests require sampling one of these substances When a woman is pregnant, her body produces a special pregnancy hormone known as hCG (human Chorionic Gonadotropin). This hormone appears in the urine as early as the first day of a missed menstrual cycle. A positive result indicates that your urine contains hCG and you can assume you are pregnant. A negative result means that no hCG has been detected and you can assume you are not pregnant.