Non-Palpable mass near chest muscle

Scout1965

Hello. I am new to this community. I have a family history of breast cancer. My mother had ductal and lobular cancer in both breasts at the same time which is really rare. My grandmother also had ductal breast cancer. My mother had double mastectomy, naturally, and my grandmother had single mastectomy. I recently underwent a diagnostic mammogram as well as an ultrasound for a 1.2 cm mass near my chest muscle. I cannot feel this mass due to the location. The radiologist said to me while he was looking at it on the ultrasound that he could not decide whether to biopsy it or do a 6 month follow-up. He chose a 6 month follow-up and told me that it was probably an island of breast tissue. He then rated it as a Bi-Rads 3 and said that I needed to repeat the Diagnostic Mammogram and Ultrasound. I have decided to get a second opinion at the Baylor Breast Center in Houston. Has anyone else had this happen and am I being over-reactive? Thank you in advance for your time.