<prompt> After how many days of ovulation embryo implantation occurs3-5 days7-9 days10-12 days13-15 days  <response>: Implantation is the process by which the blastocyst penetrates the uterine mucosa to get implanted in the endometrium.It stas on 6- 7 day after ovulation. Ref:JB Sharma Obs pg 20. 