Hi, I am 21 having sore breast especially on my left. They re both growing but my left is the one most painful. I have no other symptoms but that for almost 2 weeks now and my period is not due for another week. I had a pregnancy test done on april 22nd which came back negative but I did have a UTI and I started taking medication for it as well as a pill for yeast infection. One the first day then 3 days later another and ever since that yeast infection pill my breast have became sore to touch or put pressure on sometimes, from a 1 to 10 being painful at the moment i would say a 7 for the left and a 5 for the right. Any idea what it could be? I ve googled and saw horrific causes that it could be.