Days 1-7: The menstrual period. The uterus sheds its lining together with the unfertilised egg. This is seen as the menstrual blood loss unless the ovum has been fertilised.
Days 8-12: The uterus starts developa new lining.
Days 12-18: The ovary releases its next egg.
Day 16-22: The lining of the uterus thickens and gets ready to cope wiuth an egg that has been fertilised.
Days 23-28: If the egg has not been fertilised, the ling of the uterus starts to break starts to break down.
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