Used clorox cleanup to clean tub. wasnt even in bathroom for 5 minutes. chest feels a little tight and nauseas but no burning feelings. 28 weeks preg?

You will be OK: Avoid clorox use again, especially during the pregnancy, and if you do have to use it again, perhaps dilute it and also wear a mask. The exposure you described will not harm the fetus.

Inhaled fumes: Sounds like you inhaled some fumes. Either buy a different cleanser or dilute the one you presently have or make sure that the room is well ventilated or have your hubby do that task!