hmmm. Well, i can tell you my experience. I was 36 at diagnosis. i found a lump,my doctor found another, and also had some enlarged nodes in myarmpit. he sent me for a mammogram, which showed no sign of cancer, but did note that I had dense breast tissue. He insisted on a biopsy, sent me to a surgeon, who agreed to biopsy only because my family doc insisted. he couldn't feel anything unusual in my armpit, although I could feel the lumps there. Both of the breast lumps were invasive cancers of different types, and I had three lymph nodes that were cancerous. Up to 30 percent of all breast cancers are missed on mammograms, and this is particularly true for women under 40.
however...you have breast implants, and I'm sure you know that these are prone to adhesions, which I'm sure feel like lumps when you do a breast exam. Chances are, your doctor is right. But if my doctor had told me that my lumps were nothing and I was being overly sensitive, I would have gone home, forgotten about it, and I would be dead by now.
I don't know where you live, but most larger cities have breast centers, and I would insist on a referral to one of these. With implants, you need someone who specializes in breasts looking at this, if for nothing else, for your peace of mind. If you doctor values mental health as much as physical, then he will give you a referral. if he won't, then you may need to shop for a doctor who will listen to you.
Again...chances are, your doctor is right! But your life is not worth taking chances.
Hope this helps...Good luck!
"There's a difference between a philosophy and a bumper sticker." --Charles Schulz