After intercourse, the sperm is ejaculated into the vagina, and after an average of one and a half to six hours, it passes through the cervix into the uterine cavity and reaches the fallopian tubes, where it combines with the waiting egg to form a fertilized egg. If the sperm has not ovulated by the time it reaches the fallopian tube, the sperm waits for the egg in the fallopian tube. When ovulation occurs, the umbrella of the fallopian tube transports the egg into the fallopian tube where it combines with the sperm to form a fertilized egg. It takes 9-13 days for the egg to enter the uterine cavity through the peristaltic movement of the fallopian tube. After entering the uterine cavity, it does not immediately implant, but rather searches for a suitable location within the uterine cavity, and the search takes about 2-3 days before implantation. This is the process by which the sperm enters the uterus and reaches the fallopian tubes where it combines with the egg to form a fertilized ovum that beds in the uterine cavity it enters.