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Ovulation is the process of release of unfertilised egg. One egg cell is released every month- roughly 28 days. After puberty, hormones trigger the ovaries for the release of egg after which it travels down the fallopian tube. If the sperm fertilizes the egg then the fertilized egg gets fixed to the lining of the womb and starts growing into a baby. But if it is not fertilized then it comes out of the vagina with the menstrual blood. A female is most fertile (i.e. able to get pregnant) around the time of ovulation, which is five days before or one day after the ovulation.