Implantation can occur as soon as about 6 days after fertilization, though it most commonly happens between 8 to 10 days after ovulation (which is around the time fertilization occurs). The window for implantation is generally considered to be about 6 to 12 days post-ovulation, with 8 to 10 days being typical. The fertilized egg (blastocyst) travels through the fallopian tube, reaches the uterus around 3 to 4 days after fertilization, and then attaches itself firmly to the uterine lining in this implantation process. Implantation usually takes several days as the blastocyst burrows deeper into the uterine wall.
In summary, implantation can occur as early as 6 days after fertilization but most often between 8 and 10 days after ovulation/fertilization.
