pregnancy scare

Me and my boyfriend attempted sex today. Yes, it was unprotected, but I’m on birth control. He tried to put it in but it wouldn’t fit, only got the tip and that’s it. He didn’t cum, it was only for literally one second. But I have PTSD from Being raped a little while ago, and all I can do Is stress that I’m pregnant. Can you help convince me that I’m not please. I’m tired of stressing over this.