Periods usually refer to menstruation, and rings usually refer to birth control rings, which can be placed 3 to 7 days after menstruation. Women can prevent pregnancy by placing a birth control ring, which is mainly used for women who do not want to have children. The main reason for placing the IUD within 3~7 days after menstruation is that during this period, the uterine lining is thinner, which reduces the rejection reaction, and it can be placed in the right position to reduce vaginal bleeding. At this time, ovulation has not yet occurred, which can rule out the chances of women getting pregnant, so the birth control ring can be placed with peace of mind. It is recommended that women can go to a regular hospital, and then, under the guidance of a professional doctor to place a birth control ring, and after the operation, rest more, avoid overwork.