Breast Cancer Doctor

Without going to the doctor, how can a person know if they have breast cancer?
So are the possible forms of breast cancer?
Checking your breasts regularly, feel for lumps, etc. My wife was breastfeeding my son, he was 10 months old and was in pain, thinking it was mastitis (hope thats the spelling) and the Bloke little suck to the end. It was, she had 3 tumors of grade 3 and 3.5 cm to 2 X 2 cm. ******** After a mastectomy and 6 months of the worst F chemotherapy, etc. (which almost took his life), she is still with us (4 years today), please can that, if you suspect something, get your @ rse to doctors. Do not want anyone going through what my wife, children and I went through, or the tens of thousands of families who out there are living with, in the case