My right nipple has been tender the last two weeks. I have not been wearing bras, and have been being very genital with it. My boyfriend would suck on it a lot a few weeks ago, and I made him stop because it was getting tender. Mt nipple has no cracks, but does look a little redder then before. I am late on my period. Has is happened to you ? Is this normal ? Could this be breast cancer ? I am nineteen year old female.