I would definitely get a 2nd opinion!
My initial biopsy said I had ADH (I think ALH is similar) and I had surgery to remove it and that biopsy came back as extensive, level 2 DCIS but they ALSO found an extremely rare Invasive Metaplastic Carcinoma.
If I would have just gone with the first biopsy results and did not do surgery, in the long run, the outcome would have been much worse.
Hopefully that is not the case with yours, but much better to be safe than sorry.