I have had the mirena for 4 weeks now and i am still spotting whi...

I have had the mirena for 4 weeks now and i am still spotting which i totally expect. However i have had a constant dull ache in the left lower abdomen since it was put in which every day for a few hours turns into a stabbing pain which feels like appendicitis it is so bad but i know it can't be as i have no appendix it was removed. I was not instructed to feel for the string but been in the medical profession i thought i would as i wondered if this pain was related to the mirena? 2 days post insertion i could clearly feel the strings now i can located my cervix and i definitely have no strings does any one have any experience with this? Is this pain related to the mirena?