Under normal circumstances, it is better for women to wear the IUD within 3-7 days after menstruation, because during this period, the endometrium is thin and ovulation does not occur in the ovaries during this period. If the IUD is placed during the menstrual cycle, it will easily lead to thickening of the endometrium, causing a more serious rejection of the endometrium and increased vaginal bleeding, etc. If ovulation occurs and a fertilized egg has been formed, it may lead to pregnancy. After the IUD is placed, women should pay attention to observation, take proper rest, and give anti-blooding and anti-infection medication. If there is increased vaginal bleeding and significant lower abdominal pain, they should go to the hospital for examination and treatment in a timely manner.