Skyla and BOOBS

I got Skyla on June 1st and the past week my boobs have been SORE. They are usually like this right before my period and even are a bit larger, but they are much larger than usual and more sore than usual like when they were growing when I was in middle school. My period also hasn't started yet. Has anyone else had their boobs grow with Skyla and think that could be what this is?