I am a teen and I have always had a very easy going period. It has always been five days long, the first week of the month, and I never had any symptoms like cramps or anything just emotional sometimes. However, this month my period was not only irregular in timing but my breasts were VERY sore. I was a little worried at first due to the discomfort, pain, and sensitivity they were causing. However the next day when I started my period I assumed that it was because of that and after my period ended the breast soreness ended as well? Should I be concerned and has this happened to you before?