Is it normal for my breasts to feel numb all over?

It is not unusual to have some post op numbness after surgery. This is especially true near incisions. However, it sounds like you did not have numbness for several days and now you do. If true you need to see your surgeon to make sure all is well. Good luck.

You should see your plastic surgeon for an evaluation. Since the numbness started after surgery, it is likely due to swelling. Numbness of the arms can be related to swelling after an IV or blood pressure cuff or bandeau that is too tight, but you need to see your surgeon to be sure nothing more serious is going on.

after augmentation surgery and you should see your surgeon to be evaluated,  If the numbness is transient and comes and goes, its probably nothing but if it isn't resolving, still requires that you see your surgeon.  There are a few reasons you could have some arm numbness from surgery but they are all self limiting.