Generally, it takes about 1 week from the formation of the fertilized egg to its implantation, but there are individual differences. Fertilization occurs within 24 hours after ovulation, and after the formation of the fertilized egg, it takes 5-6 days to develop into a late-stage blastocyst through division, which implants into the uterine lining within 1-2 days to implant in the uterine lining for implantation. Therefore, it generally takes about 1 week from the formation of the fertilized egg to its implantation, but due to individual differences, it may occur earlier or later. The fertilized egg starts to secrete HCG about 1 day after its implantation, and you can follow the doctor’s instructions to confirm the pregnancy by testing the blood hCG about 10 days after the coitus, and ultrasonography about 40 days after the cessation of menstruation to determine the normal intrauterine pregnancy, and to exclude the ectopic pregnancy and gravidas and other pathologic pregnancies.