ive had the mirena in since last year june, but idk if this is even associated with it, but today i jad a ball of white and gray tissue in my urine when i went, and now im having really sharp pain in my stomach , and i dont have regular periods, havent since last july, but 2 weeks ago i bled for a week straight, and i usually only spot for 2 days every 6 to 8 weeks.what is going on?