haha...

We have all done that my self included.... in fact my razor had slight nicks to begin with (before I really started honing) and I worked them out only to do the exact same thing you just did

I'm sure the real experts will chime in here soon, but the real issue is just how big is the nick? It sounds like it wasn't too bad really if you were able to partially remove it with the pyramid. That being the case, I'm sure you will be able to resolve the nick on your own unless you get a little scared
besides the expierence will be invaluable....

Now all you need is a healthy gash and you'll be fully initiated into the faternity