Question: is it possible to have implantation bleeding 4 days after intercourse?
Answer: Implantation usually occurs between five and 10 days after fertilization. 6﻿ But as you read above, fertilization can occur as soon as a few minutes after sex or as many as five days after. This means that implantation can occur as soon as five days after you had sex or as late as 15 days after sexual intercourse.