Adenosine Triphosphate. Adenosine triphosphate (ATP) is considered by biologists to be the energy currency of life. It is the high-energy molecule that stores the energy we need to do just about everything we do.denosine Triphosphate. Adenosine triphosphate (ATP) is considered by biologists to be the energy currency of life. It is the high-energy molecule that stores the energy we need to do just about everything we do.
1 Home tests are sometimes done too soon after the missed menstrual cycle to result in a positive test. It typically takes 10 days after a missed menstrual period before the presence of hCG can be detected by the urine test.  All urine hCG tests should be done on a first morning urine sample, if possible.
Since the test will not get a positive result until enough HCG is present in the urine, home pregnancy tests work at varying points from the time of conception. According to the Mayo Clinic, most pregnancy tests will not show a positive result until at least one day after your missed period, or about 12 to 14 days from conception. The one exception to this rule is the First Response Early Pregnancy Test, which has shown the ability to detect pregnancy up to five days before your period.