stereotactic biopsy following “suspicious” Microcalcifications

I have been ubder the care of a breast doctor for three years regarding my dense breast tissue and calcifications. Rewind to 8 months ago, I discovered a strange lump on my left breast in which it sparked a diagnostic mammo and ultrasound. My first one was performed in July 2018. It was sent over to my primary care physician who shrugged it off even though it was “suspicious and abnormal". I asked to be referred back out to my breast doctor that I had seen prior. I met with her the following month August 2018. She stated some things about the microcalcifications and what not, but honestly she didn't really seem concerned, at least she just said that she wanted to “watch and wait" and to follow up with another diagnostic mammo and ultrasound January 2019. This test was performed last week like clockwork. I had the mammogram done first, they had me wait while they sent it to the radiologist to make sure he could read it and everything he needed was there. I was given the OK to go to the ultrasound tech for her to perform her test. Although she seem to have some concerns with looking at it as she kept on going back-and-forth from her computer (looking at old prior images) to current trying to locate certain things and make sure she had all the pictures she needed for the radiologist . I then went and waited while she contacted the radiologist for an OK to go ahead and leave, only this time I was called back to talk to the radiologist over the phone. He explained to me that I had clusters of microcalcifications .....then went on to say he had looked at the prior images with the microcalcifications but he had some new concern now because they had changed pattern, shape and size. He was concerned with my family history of cancer and my current complaints of feeling unwell. He wanted a biopsy done as soon as possible. Yesterday they called me to schedule the biopsy in which the woman,who was extremely friendly explained to me that I would be getting a stereotactic breast biopsy. It would take 90 to 120 minutes and I would have the results back within 48 hours. I've yet to see my actual mammogram reports. I'm going to go up to the testing facility to pick them up now. Should I be worried about these calcifications? Could it be a coincidence or this for the reasons I've felt ubder the weather and lost a significant amount of weight lately to this??