How does NO CONTACT works?

So it’s going on a week since our last fight and beside a petty pic txt she sent me and my petty reply 3days ago we haven’t spoken with each other. Usually I’m the one who gives in. But this time I’m maintaining on standing my ground. Honestly she could call me right now and say sorry and I’ll take her back but the fact she hasn’t called hurts my heart soooo bad. I want to call just to hear her voice. But I️ keep tell myself she messed up. Is it safe to say it’s over........