Conception: The Facts

Implantation of a fertilized egg normally takes place 6 to 12 days after ovulation. The process begins 24 hours after fertilization. The egg rapidly divides into many cells. It remains in the fallopian tube for about 3 days. The fertilized egg is now called a zygote. It continues to divide as it slowly travels through the fallopian tube to the uterus. The zygote evolves into a blastocyst, which is a hollow ball of cells. Its next task is to attach itself to the endometrium, which is the inner lining of the uterus; this process is called implantation. Before this can happen, the blastocyst must break out of its protective covering. Some women notice slight vaginal bleeding or spotting for a day or two during implantation.