The female reproductive system is designed to produce and support pregnancy. Each month the walls of the uterus thicken and develop a rich system of blood vessels in order to made a "nest" for the embryo. when this process is completed, one (usually) ovary will send an egg down the fallopian tube to the uterus. If the egg is fertilized it attaches itself to the uterine wall, and the pregnancy begins. If it is not fertilized, the "nest" sloughs off and exits the body in the Menstrual flow. Exactly When the egg is released in this process has been a question that people have been trying to answer for Generations, because, if we knew That, it would be easy to come up with a contraceptive method that would be simple and foolproof. The answer is that every woman is different, every month is different, and we just plain don't know. It usually happens about the middle of the cycle (1st day of period - 1st day of period) but just When in the middle nobody knows. The upshot is that the only time you can be Sure that a woman Can't get pregnant is during her period.
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