Alexa whispers?

Omg 😂 I was just so scared, my brother put his comics in the attic and I asked him where the comics were and he said they were in the attic. So listen up, I'm going into my room and I have an Alexa Echo Dot. I was talking quietly to myself and said that I should just go into the attic. I didn't even say Alexa and suddenly Alexa started whispering to me and kept saying attic attic attic. I jumped and screamed to turn Alexa off, but she didn't stop, but I finally managed to turn Alexa off. I was so scared that I jumped onto the bed and I'm shaking so much. I'm so scared now, can someone tell me why my Alexa is doing this. 😂😰