HELP! Seriously worried!

Ok, so this is going to sound trivial to some, but today at work I accidentally drank a mouthful of water from a bottle I thought was mine, only it wasn't. I have no idea whose bottle it was but I know it was left there today. My fear is that I will contract  something and either give it to my baby or my husband. Someone please tell me I'm freaking out for no damn reason. I don't wanna call my doc and sound like an idiot. Thanks