Thank you all for your support and best wishes! I feel better now that I've read these answers. Take care!
A baseline mammogram is often called back for additional views and ultrasound. Being that the Radiologist has nothing to compare your new images to (say a mammogram 2 years ago), it can sometimes be difficult to say what is "normal" for your breast tissue. In mammography, the Radiologist looks for "changes" in breast tissue over time. So in 6 months, if all is unchanged, it is probably just "normal" breast tissue. I can understand your concern with your mothers history, but seeing as how the Radiologist is being cautious with an early followup (and not recommending a biopsy ;) ), I think you can relax and have another check up in 6 months.
Best wishes......
Evidently the Radiologist has determined that only a re-check in 6 months is necessary at this point. Radiologists are very experienced since they read these films on a daily basis and I would trust his/her recommendation. If you are terribly uncomfortable with the advice then there is no reason not to seek the opinion of a Breast Specialist and have them review your films. Do whatever gives you peace of mind, OK ?? Regards....