did I pull a no call no show???

Yes and yes it does count. You agreed to come in, but you didn't show up and you didn't call them to say you wouldn't be coming. You left them short staffed, if they needed you to cover for some one. You can get written up and or fired for that. 

You don't always have to agree to come in when they ask you to. Put your phone on silent mode if you don't want to come in when you're not scheduled. 

You are screwed.  They called you because they needed someone to cover at the last minute.  You left them hanging after you said you would cover it. You are a no call, no show. If you want to keep a job, you're going to have to learn to be more responsible.

Yep. Your days are probably numbered at that job.

Yes, you no-called/no-showed. 

By the way, "would of" is not a thing in English.   It's "would've" which is a contraction of "would have".