I've been hearing stuff... I don't know if I should be concerned yet, though? I wonder if I might be on the border of developing some sort of psychotic disorder, but not a lot has happened yet.

Recently, while walking home from school, I heard unintelligible yet loud whispering (maybe sounded something like "god damn it" but it was difficult to make out), as if it were coming from someone really close / breathing down my neck. I remember I whipped my head around to see who it was, but no one was there.

A day or two later, I was on Skype with a friend when she went to go take her dog out, leaving me by myself. It was then that I heard a man's voice doing an odd chant over some really creepy music. It went on for about 20 seconds, then stopped. Then it would start again a minute later, then stop after 20 seconds. Then it would start again, and finally, stop for the last time. I was searching on my computer for anything that it could have been, but I never found anything playing. When my friend came back, I asked her, "what the hell are you listening to?" And she just said, "huh?" And I explained what I heard. She started getting really scared and told me not to mess with her because it was night time she was home alone. And then she kept asking me to describe what I heard in more detail. She was getting really freaked out so I tried to change the subject, but she kept pressing on and begged me to explain what I was hearing better. Eventually we moved on, but I never found out what it was?? Maybe it really was my computer... but I didn't find anything that would have done that. I wish I would have thought of muting the volume at the time, but I didn't. The reason I am worried about that incident is the fact that I heard that whisper that sounded just as real as any physical voice but came out of nowhere just a couple days before...

Before this happened, I was somewhat aware of the possibility that I might be in a prodromal phase since I have a lot of the negative symptoms of schizophrenia, but I tried to forget about that since prodromal symptoms are so vague and can apply to so many other things besides schizophrenia. Figured I was probably just being a hypochondriac - do you think maybe I still am?

Anyway, to reiterate, my question was... When should I start worrying?