In the reproductive cycle in women, the uterus the menstrual cycle every month to prepare for pregnancy, menstrual instance is on the first day of the first day of the menstrual cycle. Because ovulation usually occurs on the 14th day menstrual cycle, menstruation after two weeks if it has not come on time, you may have been pregnant.
Fertilization with up to 300 million sperm into the vagina, but only hundreds of reach the fallopian tubes, when hundreds of sperm and egg meet, tried to pass through transparent protective layer of egg release an enzyme, the enzyme will allow a sperm through the egg\'s protective layer, this is the moment of fertilization.
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