what do I do? 😬

I was sending naked pictures to someone on snapchat and then I accidentally sent it to the wrong person!!! he opened the message and I said that it wasn't me and that I didn't know what it was and he was asking wtf was that and that he was confused. I don't know what to do because I'm panicking and I have to face him at school so kndont know what he's going to say, any help!😰