Kind of freaking out.

So, I know I'm probably over exaggerating, but I do NOT drink off people or let people drink or eat off me. So today at work my coworker set her water bottle (same as mine Kirkland brand) next to mine and when I came back I grabbed the wrong water bottle and sipped it and she said that one was hers. I'm 6 months pregnant and freaking out that I could catch something. Am I being crazy and over cautious? I'm weird about sharing when I'm not pregnant and now im stressing...