How many days after follicle puncture does the fertilized egg implant?

Patient's question:

I had an ultrasound examination on the 23rd and 24th of this month. The left ovarian follicle had a thick capsule measuring 2419, so an oocyte retrieval surgery was performed in the afternoon of the 24th. I had intercourse on the night of the 23rd and again in the evening of the 24th. Later, I consulted the doctor by phone and was told that implantation of the fertilized egg would only take 2-3 days after this surgery, but when I searched online, it said it usually takes 8 days. Starting from the 4th and 5th days, I felt extremely sleepy. In the evening of the 5th day, I had two episodes of sharp pain in the lower abdomen. I am currently taking progesterone.

Doctor's answer:

Generally speaking, your chances of pregnancy are relatively high. The fertilized egg can implant 7 days after fertilization. Based on the time of intercourse, it is not possible to determine the sex of the fetus. The sex of the fetus can only be determined between 4-5 months of pregnancy.
Recommendations:
According to your description, it is recommended to rest in bed, enhance nutrition, and promptly check the development of the embryo at the hospital.

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