Sore breast

Megan
I am a ftm. I had a biopsy done on my left breast a few months back as I have a large lump my doctor was concerned about. It is just a big fibroadnoma (sp?) so no worried. There has been the concern that it would get in the way of breast feeding but since both breasts are leaking pretty equally at this point the concern has diminished. But I woke up this morning with terrible pain in my left breast. It is throbbing. There is no redness, rash, swelling, etc. Just pain. It is there whether or not I wear a bra. Has anybody dealt with anything similar? I am nearly 31 weeks. It doesn't appear that there is any infection so I am not sure what to do. Obviously if it continues I will go to the doctor. Just wondering if anybody else has dealt with it and what the outcome was?