Period 11 days early. bad cramps in pelvis and back with bad headache. also have a cold. have had mirena (levonorgestrel) for a year. is something wrong?

Bleeding: Breakthrough bleeding (bleeding at the wrong time) is very common on all forms of birth control. It happens in about 1/3 of users. Its no big deal and usually self corrects over time. If you are not satisfied or it continues to happen then consider using a different birth control method. It is a common side effect and does not mean something is wrong or that the iud is not working.