Hi there. It's hard to say Don't worry. Because I know I would, but I worry about everything!! I work at a radiology facility for over twenty years and it is very common to be called back. Many times it is resolved with further testing. Maybe a follow up again in 6 months to keep an eye on things. And yes, sometimes, there is a problem. Just know, as another has said, if there is a problem it is treatable.
There is another thread somewhere in the Dis dedicated to breast cancer and it's info and members were priceless to me at the time my mother was diagnosed w breast cancer. (Was treated, it sucked, but she is doing great 7 years later!) But one thing that was said, that I still think of to this day, in many situations, is "Don't bleed til you're shot". It's very hard, but try not to imagine worst case scenario. Hang in there!!!! It is nerve wracking! Sending you wishes for good results and strength while you go through this!!!