Okay, I'm freaking out. I'm pregnant. Please please please tell me something comforting?

This was so not in the plans. I was supposed to be married first. He had a vasectomy and it happened anyway. I'm shocked and terrified. I want to keep it but I'm not ready. I'm not ready!!! This is so huge and scary and I'm at work and I don't want to tell anyone until the threat of miscarriage is passed. Please tell me you have some good advice? Or words of wisdom? Or anything you think would help me?