Evolution and survival of the fittest are not the same thing. Evolution refers to the cumulative changes in a population or species through time. Survival of the fittest is a popular term that refers to the process of natural selection, a mechanism that drives evolutionary change.
Most doctors recommend that you wait until the first day of your missed period before taking a home pregnancy test. A missed period is usually one of the first signs of pregnancy. This is usually around two weeks after conception. However, some tests are more sensitive than others and can be taken earlier. Concentrations of hCG are reported in milliInternational Units (mIU) or amounts equal to 1/1000th of an IU per milliliter.
ClearblueÂ® Pregnancy Tests can be used up to 4 days before your expected period1, although the pregnancy hormone levels in your urine may not be high enough to be detected. So if you test early and you get a âNot Pregnantâ test result, we recommend you test again when you your period is due.