What to expect if its breast cancer

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Im 26 and i just found a lump on my right breast, i got scheduled an appt for next week but im already freaking out! Theres no history of cancer on either side of my family. All I can do is cry right now. I have a 2.5 year old baby and a 1 year old baby, and all i can think of is what is there future guna be with out me, their dad is struggling with drug abuse, and im just so worried about my kids? Theyre so small, I just dont know how to feel or what to expect and I haven’t told my family yet