5~6 days after ovulation is not the window period for transplantation. 3~5 days after ovulation belongs to the window period of transplantation, if you choose to transplant 5~6 days after ovulation is a little bit late, it may affect the chances of successful fertilization. Normally speaking, you can choose to transfer within 3~5 days after ovulation in a natural cycle, because the estrogen and progesterone levels in the body are relatively high during this period, which is more conducive to the embryo’s implantation and development after the transfer. If you choose to transfer 5~6 days after ovulation, it is a little bit late, which will affect the chance of successful transfer. Transplantation within 3~5 days after ovulation in a natural cycle is relatively high in progesterone, which will stabilize the smooth muscle of the uterus and avoid uterine contractions, which is more conducive to the stabilization of the intrauterine environment and the implantation of the embryo. To do IVF transplantation, it is recommended to choose a regular hospital, do the relevant examinations and preparations before the operation, and choose the right time for the transplantation according to the conditions of the mother.