What is the reason for late implantation of the fertilized egg

Patient's question:

No

Doctor's answer:

Hello, implantation is basically the fertilized egg burrowing into the endometrium. Sperm and egg do not necessarily meet and combine during ovulation. After ovulation, the egg can survive in the body for 5 days or even longer. After ovulation, sperm and egg meet and combine to form a fertilized egg. The fertilized egg implants in 6-7 days, which is basically constant.