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This could be due to many causes. You need to rule them out by visiting a Gynaecologist. Start by getting a PAP smear
to look for unfections and early signs of cancer if the cervix, get an ultrasound
to look for fibroids, endometriosis
, ovarian disorders as well. You haven't mentioned in which month the IUD took place in the pregnancy. Are you on any medication. Before getting treatment, you need to find the correct cause of this which a Gynaecologist will be able to help. Keep me posted on your developments. GOOD LUCK !!!!