Hello,
This pain can be due to ovarian cysts. Mostly they are symptomless But Ovarian cysts can, however, cause problems if they twist, bleed, or rupture. Most ovarian cysts will go away on their own.
However for the cramping get pain killers prescribed from a gynecologist. Also get an ultrasound abdomen done to confirm the diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I had the mirena in for 5 years and some months I'm like that I don't think there is anything to worry about but if you are concerned go and see your Dr x all the best x