Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency help for severe uncontrolled bleeding, fainting, new trouble breathing or severe chest pain.
Contact the biopsy team promptly if pain or swelling is worsening rather than improving, or if you develop fever, spreading redness, increasing warmth, pus-like discharge or a rapidly enlarging bruise.
Call the facility urgently if bleeding continues despite firm, uninterrupted pressure for the time stated in your discharge instructions.
These are not routine recovery symptoms.
For non-urgent questions about your dressing, activity or expected results date, contact the facility during normal hours.
The article also says
Some bruising, mild swelling and tenderness are expected.
Every sign above is quoted from the sofidex article on Breast biopsy - stereotactic. If you are not sure, err upward — it is always reasonable to be checked.