40YO W/F, No Maternal Fam Hx of Breast Cancer, Unknown Hx on Paternal side, Surgical Menopause/LAVH 2 years ago, use Vivelle Dot, no common risk factors other than overweight and starting menstruation at 10yo. Recently had annual exam w/GYN.  Although I have always in past had small "lumps and bumps" in my breasts he could tell by palpating them that they were normal.  This time he was very concerned when he felt a lump (I also recently noticed).  It's at 12:00 , very firm and immovable.  It is more long than wide - If I lay my fingers over it I can clearly feel it for 3 fingers. Feels like it starts in the flat part of chest and gradually gets more noticeable as it extends into fatty part of breast where it ends feeling "rounded" when you feel it on the end.  

Diag Mammo (supplemented by marker and spot compress) and Ultrasound came out normal - "...average tissue density.  Minimal benign calcif...No discrete abnormality seen...Normal fibroglandular tissue echogenicity throughout right breast, (only right was U/S), specifically, no sonographic abnormality is appreciated at the 12 o'clock region... Impression: Benign findings, negative.

I asked Gyn if he felt further investigation was warranted and he says he's very reassured by report and for me to just watch it, come back if it grows or new lumps, otherwise return in a year.  I thought anytime there was a lump that was not a cyst they would biopsy it, but Gyn says since US and Mammo both are neg that it is not neccessary.  I trust Doc, but am a worry-wart, (I admit it!). Is just "watching it" normal protocol?