Well I've had Mirena for 2.5 years nows and about a year ago I had some cramping on and off with light bleeding and turned out I had an infection. At first they couldn't find it they tested me for stds... which I know I didn't have cause I've been with my husband for 4 years. Once I stopped bleeding and went back to the doctor my cervix was swollen and red which I guess my doctor could see since I wasn't bleeding and put me on two antibiotics. I've had it happen to me a couple more times which is very painful but was given the antibiotics again with no problem. I even debated getting the mirena out... but since my husband and I aren't ready for another baby, I didn't want to take the chance with another BC. Other then thoses few issues I haven't had any problem and love my mirena. But I would go back to your doctor if your pain keeps up. My doctor gave me Flagyl you may want to write that down and tell your doctor it may be the answer to your prayers. It sure was mine when it happened to me. Good Luck!