No. The presence of psychosis would automatically mean BP1. But I'm not sure that hearing a voice when very stressed necessarily means that is going to happen again for you. It may just be a fluke.

If you are only on fluoxetine then you may need a mood stabilizer added to help prevent further weirdness. You should definitely bring this up to your dr. at the next visit and be aware of anything else weird and whether it only happens when you are under a lot of stress or if it is more consistent.