I discovered a very large lump in my right breast while doing a breast exam on myself. I check myself regularly and never felt this before. its so big & hard that it would be really hard to miss. My question is, could a lump this big be cancer and if it is does it mean I didn't find it in time due to its size? Please help!! I'm going crazy wondering. I have an appointment on Monday but I am terrified of what the outcome will be.