sore breasts can be a side effect of birth control, even two years after you started, however, it is still unusual for you to suddenly have aide wedge at hat you didn't have before of the same pills. if you have had other medications recently, such as antibiotics, this might have affected how your body reacts to the birth control and it should resolve after you stop the other medications.
however, if the symptoms persist, you might want to see your doctor to make sure there isn't another problem such as a prolactin
hormone problem or maybe you can try a different birth control.
I hope this helps, please let me know if you have any more questions.