Where does a fertilized egg spend most of its time?

Perhaps it is just the wording here that is confusing, but a fertilized egg is only a 'fertilized egg' momentarily.

Explanation:

Once released from the ovary, the unfertilized egg enters the fallopian tube and travels toward the uterus.  The egg is headed in search of the sperm.  Fertilization occurs when the egg and the sperm unite.  Once the egg and sperm unite, the resulting mass is referred to as a zygote.  The zygote them implants itself in the wall of the uterus (endometrium) and is supported there throughout pregnancy.

not really sure sorry just trying to get points