Repeated breast biopsy, has this happened to anyone?

Hi all, I had my first biopsy 3 weeks ago. I got the results last week, and was told the results were inconclusive as the results said it was healthy breast tissue, and they feel that didn't collaborate with the scan and mammogram as clearly there is a lump. I had the biopsy repeated last week, and going through the waiting game again. Has this happened to anyone? 
I've read about false negative results. Could this be it? Or am I over thinking. So stressful