Question: after how many days of embryo transfer implantation occur?
Answer: Timing of embryo implantation in humans Human blastocysts should hatch from the shell and begin to implant 1-2 days after day 5 IVF blastocyst transfer. In a natural situation (not IVF), the blastocyst should hatch and implant at the same time - about 6 to 10 days after ovulation.