Hi,
It’s hard to say, because when Radiologists assign a BIRADS score 4 it means that the lesion is just suspicious but nothing more than that. With a category 4, a biopsy is always recommended to check the suspicious area to make sure that cancer is ruled out. Try not to worry too much and keep in mind that very often biopsies done on suspicious lesions turn out negative for cancer.
Hoping that everything will be just fine for you too.
Best wishes…