Questions for breast specialist

I just turned 40 a few months ago, I had a baseline mammogram at 35 two years post elective breast reduction. I had my first screening mammogram in the beginning of July and got a call back for an asymmetry not seen on my previous mammogram. I talked to the mammo tech and she assured me it was probably just a skin fold. I was scheduled out six weeks for the diagnostic mammogram and didn't think much about it until a week before and decided to look around. While looking in the mirror I raised my arm above my head and noticed a puckering along the scar in the crease along the bottom of my breast, that was definitely new. I started to feel around and felt a hard thick area that didn't feel like the rest of the breast and was also not symmetrical with my left breast. I have pretty lumpy breasts so although I do self exams I never feel very confident about them but this spot just struck me as different. A few days later I was feeling around in the same area and felt a lump. It's basically at the farthest inner lower corner of my breast, it's moveable and not hard like they always say cancer feels so I wasn’t too worried. I went to my diagnostic mammogram, which ended up negative for the asymmetry I was sent for in the first place but I told the tech about the puckering and thelump. They did some spot pictures on the lump and also an US- both were negative. Even though the mammo tech, the US tech and the radiologist all said they could feel the lump the radiologist ended up saying- "I can't see anything on US so I can't biopsy something I can't see (which I didn't ask if she could) and both the lump and the puckering are probably just scar tissue. You can follow up with your gyn or see a breast specialist" I was frozen and didn't ask any questions. I decided to see a breast specialist which is scheduled this week. I'm just wondering if the breast specialist says the same thing, should I push for more testing or just accept that it's "probably just scar tissue"? I know the odds are majorly in the favor of something benign but I just have an unsettled feeling. I'm mostly worried about waiting...stage iv cancer scares me.