I'd just like to reassure you also that most biopsy
results (actually about 80%) end up benign, so please try to remain positive. In
your case it sounds like your doctor is pretty sure that it's benign, but "pretty sure" isn't good enough when it comes to breast cancer and only a biopsy can tell for sure. Even if it's not benign, when found early (and your lump is very small) it's highly treatable with a good chance for no evidence of disease down the road.