A small speck of blood is okay, but if the bleeding is consistent, then it is not normal.
UUsually, a change in toothbrush, or a change in water, or even a change in toothpaste can result in minor bleeding.
But if everytime you floss or brush, there’s bleeding, then the problem could be with gingivitis, tartar, cavity, plaque, or bruxism.
Refer to an expert, if the bleeding persists for a long time.