How soon after unprotected intercourse do you get implantation?

Implantation typically occurs about 6 to 10 days after unprotected intercourse, assuming that fertilization has taken place. After ovulation, the egg is fertilized within 12 to 24 hours, and then it takes several days for the fertilized egg (blastocyst) to travel to the uterus and implant into the uterine lining. Therefore, implantation can happen roughly 1 to 2 weeks after unprotected intercourse.