Chest Pain

Since I started my birth control about a month ago (I'm on Necon 7/7/7), I've been having chest/breast pains in my right side. Should I be worried? I read breast tenderness was to be a side effect, but think it's weird to occur on only one side. It doesn't feel tender or sore, just hurts every once in a while since I've started. The breast on the right side is a little larger than the other. Could that be a factor? Any additional thoughts???