Hi - I had been noticing that my left breast was very, very sore during my second pregnancy and when the doctor checked it out she said she felt something "cystic". I couldn't get a mammogram because I was pregnant. So the dr. sent me for an ultrasound and all they said they could find was a lymph node where the pain in my breast was. What is this - is this a sign of cancer? Should I be concerned? Will the soreness in my breast ever go away?