what stage of menstruation does bleeding occur during
These changes occur in response to the hormones, estrogen and progesterone, secreted by the ovaries during the ovarian cycle of menstruation. The Uterine cycle of menstruation starts from the first day of the menstrual period, which is also the first day of bleeding. (A) The Menstrual Phase. This phase is also called the 'bleeding phase' or the 'menstrual period'. It usually lasts from the 1st to the 5th day of the cycle. The duration of bleeding can vary from 2 days to 7 days in different women.