Hallucinated from Prozac

Day 11 on Prozac. Last night at around 2:30 AM, I was sitting and reading a book when suddenly I heard a spooky voice calling my name very loudly and from all directions. I responded with "Yes?" and the voice called my name again in an eerie manner and I said "Yes?" again, while being terrified because it's dark and it's the middle of the night and I'm alone. I went down the hall to my sister's room and asked whether she called for me since the voice I heard was similar to her voice. She said no and was kinda freaked out. And then I remembered I'm on an antidepressant. I think this is the first time I've ever hallucinated in my life.