Can an egg still implant itself to the uterus within 5 days after a peiod has just ended?

Difficult. The endometrium(lining of the womb) is very minimal from estrogen stimlation only(no progesterone) and it would be very difficult for an egg to have left the ovary during such a time in the menstrual cycle as well as implant. However, in the field of fertility, nothing is impossible.