I used to have stuff like that happen when I was a young teen. One time my sister (who was in the living room) said "what Beth? did you say something?". I was in the bathroom brushing my hair and hadn't said anything. BUT, I was thinking about dyeing my hair. I told my sister, "I didn't say anything". She replied "it sounded like you'd said you wanted to dye your hair".
Stuff like that always sorta freaked me out, but it was common. I could tell you even wilder stories about a friend of mine that could repeat word for word what you were thinking. I used to tease her in class, calling her name in my head in a "odd" way - thinking Hiiiiiiiilleryyyyyy. As if I was calling to her. She'd get so agrivated with me.
I could see her tense up every time I called to her in my head. As soon as she got a chance she'd tell me "SHUT UP", and repeat the exact way I had said it in my head. I loved it.