Breast and Nipple Tenderness in Both Breasts

I have been exeriencing breast and nipple tenderness for aprox 2 weeks.  The first day of my last period was November 17, 2009.  I had a tubal ligation 4 years ago.  My breasts are not only tender but heavy - when I take my bra off is when it is the worst.  I have cut out all caffeine with no changes.  I have not been working out or lifting heavy items.  I just had my yearly exam a week ago.   There was nothing abnormal in my breasts.  They did a pregnancy test just to make sure.. it was negative,  but early to take one - so she said t take one in another two weeks from then.  Any ideas what is going on??

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