Two of my three daughters found lumps in their breasts, one of them on two separate occasions, and tests were carried out - in each case, thank god, nothing serious was found, but at the time it was very worrying especially because my mum died from breast cancer, in both breasts, and my aunt also had breast cancer, which was successfully treated. Also their mother died from cancer, and also my father died from cancer, so high incidences of it in my family.
The sooner you know what it is, the better for you, wishing you a healthy outcome.