Cancerous or not Cancerous

Sarah
Last night my SO found a lump on my boob and asked me about it, we haven't been together for a lengthy amount of time, he compared it to the other boob and only one had it. He asked if I had cancer. I'm extremely worried and I have a Drs appointment today. He's as worried as I am. I'm worried he's gonna leave me if its cancerous and I'm gonna have nobody.