Did you consume caffeine while trying to conceive and still got pregnant?

I'm a Mormon and part of our religion is keeping our bodies free of addictions of any kind. With that said, I rarely ever drink or eat anything that contains caffeine. Today, because of circumstances beyond my control, I had no choice to but to partake in a little caffeine (a Pepsi, probably a little more than 12 oz. A little more than 38 mg of caffeine). I've heard that caffeine could possibly make it harder to conceive. I'm worried that I've messed up my chances this month! Some reassurance would be great! Thanks, ladies!