It takes 6-8 days for implantation, about 7 days on average. After coitus between the man and woman, the ovary discharged into the abdominal cavity of the egg is picked up by the fallopian tube, the male ejaculation of sperm and egg in the fallopian tube meet in the potbelly, and then peristaltic tubal sperm and egg transported to the uterine cavity, in the embryo after fertilization of about 7 days, the fertilized egg enters the uterine cavity and gradually with the endometrium, this is the process of implantation of the fertilized egg. Fertilized egg formation after the 6th-8th day may be bed, on average, about 7 days, the specific circumstances vary from person to person, there will be differences between individuals, some women may be biochemical pregnancy, the fertilized egg can not be successfully implanted in the body of the woman. The trophoblast cells begin to secrete human chorionic gonadotropin after the fertilized egg has been successfully deposited. After an interval of 5-7 days, a blood test for HCG and a urine pregnancy test can be taken to determine whether conception has been successful.