Usually the blossum blight looks blackish around the flowers on the stem? Check this photo out.
It does stop many, but not brown rot. You need Infuse, and/or Bonide Fruit Tree and Plant Guard. Both by Bonide, I rotate them. Plant guard has an insecticide too, and some don’t need it, I myself do, so not an issue. I would treat the trees this year too. You want to limit the amount of spores and such, so I would start ASAP. You may have lost all fruit, but the fungi will remain on the plant, take care of that now.
Early in the year chlorothalonil, and captan can be used too.
The first two mentioned have different modes of action so using both really puts a whammy on brown rot.