I've heard of people eating bread that had mold on it but not knowing it because the only visible mold was on the other side of the loaf, they had eaten it for a few days and had the shits
Bread mold is not one universal thing, while certain molds may be more common, without doing involved identification you will not be able to determine the species and therefore safety of bread mold. Even if the majority of the time it is a safe species, you should not be knowingly risking it.