Unwanted

On New Year's Day, about 3 am, some guy texted me and said he winter to show me something. Me, being the naive person I am, said okay.
I think you know where this is going. 
He sent me a dick pic, which I immediately reported and then deleted the conversation. I blocked him and moved on. That's it, right?
Nope. 
Today someone mentioned it, weeks after it happened, and asked me if it really happened. I don't really have a reputation at school and I don't care, but I'm still kind of scared?? Can someone help me??