Ovulation occurs on the fourteenth day of the first day of the beginning of menstruation, in which the ovum emerges from the ovary to the abdominal cavity where it is flattened by the fingers of the fallopian tube and despite the darkness. Although the size of the egg is like the head of the pin, the fingers of the fallopian tube and the appreciation of the Almighty never make mistakes in rare cases , After the ovulation of the ovary, the membranes surrounding the egg turn into the so-called yellow body and start with the secretion of the hormone bergestron.