Could the mirena (levonorgestrel) coil be causing the pain in my pelvis?

Possibly: It is possible (i assume you mean the Mirena (levonorgestrel) iud). You should be seen.

Unlikely: Mirena (levonorgestrel) iud has a tail that you will not see which your doctor will use someday to remove. It does not have coils like the essure system. Iud's can cause cramping and discomfort, but very rare with the Mirena (levonorgestrel) iud. You should see your doctor for an exam with possible ultrasound to see if it is indeed in the appropriate place.