No, Progesterone does not stop the period. In fact, Progesterone is involved in regulating the menstrual cycle. During the menstrual cycle, Progesterone levels increase during the luteal phase, which follows ovulation. If pregnancy does not occur, Progesterone levels decline, leading to the shedding of the uterine lining and the start of a new menstrual period. However, there are situations where Progesterone supplementation may be used to regulate or control the menstrual cycle. For example, in certain medical conditions or during fertility treatments, Progesterone may be prescribed to induce a withdrawal bleeding or to support the uterine lining. It is important to note that the effects of Progesterone on the menstrual cycle should be discussed with a healthcare professional who can provide personalized guidance based on individual circumstances and specific medical needs.