Pregnancy is tested by the presence of a hormone called hCG in urine or blood. This hormone is secreted by the chorion of the fertilized egg and later by the placenta. Egg after fertilization can take 12-14 days to implant in the uterus. Ideally, pregnancy test should be used on the missing date of periods. Pregnancy test can be done after 12-14 days of conception. When this conception took place, no body knows, so, it is better to wait for due dates of periods and get test if no periods.
