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Every month there is a small window of opportunity for a man and women to conceive, so timing is very important. An egg can be fertilized for a maximum of 24 hours after it is released from the ovary, according to pregnancy and childbirth expert Sheila Kitzinger. Therefore, a woman needs to understand how her menstrual cycle works and make an educated guess about when she will release an egg, also known as ovulating.
Fertilisation is now complete. Sperm are able to survive for 2-3 days within the female's reproductive tract. The length of the time that a woman's egg can be fertilized by a man's sperm ranges from 12-24 hours. The fertilized egg then undergoes several divisions to form a structure called the zygote.It moves into the uterus within a period of 5-7 days and is then termed as embryo.he fertilised egg, now known as an embryo, develops in the fallopian tube for the first three days, then travels down into the uterus. By the fifth day it will become a blastocyst, a hollow ball of cells surrounding a cyst-like cavity.