Please get any lumps checked, they need to be taken seriously especially during pregnancy & lactation when normal breast changes may allow abnormal changes to go undetected/ignored. The vast majority of lumps are not serious, but if it were to be cancerous, early detection and treatment is the most important factor in disease-free survival.

If your dr is concerned by the lump and wishes to investigate it further, you should know that an ultrasound alone is not enough to rule out cancer. An US in conjunction with a mammogram, a fine needle biopsy, or a MRI is more accurate than an US alone. I reported a lump in pregnancy, and was screened using only an US...it turns out the early cancer I have is *not* visible on US...two years down the track and the tumour has grown to the extent that i now need a mastectomy...7 cms long and *still* not visible on US. So please don't be afraid to insist on tests and don't let your dr dismiss your concerns like I did.

Good luck, I look forward to hearing how you get on at the drs.