I used bleach to clean a concrete floor, was that a bad idea? Will I be OK?
If you are ok now, you will be ok. The only issue is being overwhelmed by fumes while doing the cleaning.
A good idea but get it up with rinse water or it will dry to a white powdery stain.
wash with plain water and you're good. do it twice -- damp bleach will attack clothes dropped on the floor
As long as you had enough ventilation then you will be fine. It's if you do it in a small place without some form of ventilation. If you where to get a side effect it would be dizzyness and a headache, well that's what I got once when cleaned a floor without proper ventilation.