Welcome to Healthcare Magic
IUD implants are known to be associated with heavy irregular bleeding and pain as common side effects. It may also be automatically dropped off from your uterus
. Keep checking the presence of the thread which hangs from it in your vagina. In case it has fallen off you may be having your Periods in a heavy flow. Please check. What the Nurse meant was that the pain you were experiencing was probably due to egg formed on your ovaries, meaning a Corpus luteal cyst
which are fairly common and usually don;t require treatment unless they cause complications. They are known to cause mild bleeding inside your abdomen which can irritate and produce pain. But this is only one of the causes. You need to review the Ultrasound
report with your Gynaecologist to confirm other causes.