You and your doctor have done everything right so far. Continue on that path and get the biopsy done. Like you have been told by other ladies on this board it is the only 100% way to know for sure.
There is not a family history of B/C in my family either and I was dx at 55. I actually had to have a lumpectomy for the right dx. but then I had a very rare type of B/C. So make the appointments now and relieve your worries.
Please stay with us and let us know what is happening. Remember you are your best supporter and you are the boss.