Got iud 4 wks ago.bled for 13 days then discharge for few days then nothing for 3 day.then bleeding again.now day 5 and had almost 45ml of blood today?

Vaginal bleeding: IUD's can be moved into the cervical canal, or not installed in the proper location , which can cause prolonged bleeding and cramping. Another possibility is pregnancy which may not be in the uterus (ectopic). See your gyn physician ASAP, who installed the IUD for a serum HCG test, ultrasound and exam , and possible removal of the IUD.