It takes 6-7 days for a fertilized egg to successfully implant. The process of implantation of the embryo into the endometrium after 6-7 days of fertilization is known as implantation. Fertilized egg implantation occurs through 3 processes: localization, adhesion and invasion. It requires estrogen and progesterone secreted by the corpus luteum, hormonal support of a tolerant endometrium, synchronized development of the blastocyst and endometrium, and functional coordination for successful implantation. This process generally takes 6-7 days. Soon after the fertilized egg has successfully implanted in the uterine cavity, human chorionic gonadotropin is released. If a positive pregnancy test is detected by examination and a gestational sac is found in the uterine cavity by ultrasonography, you are pregnant. During pregnancy, you should pay attention to strengthen the nutrition, maintain a good lifestyle and pay attention to the regular maternity checkups.