I was exposed to c dif yesterday how long before symptoms if i take it, & is there anything i can do to keep from takin it?

Relax: C difficile is mainly dangerous to people that have immune suppression or otherwise ill, especially those on antibiotics; if you have normal immune system and not on antibiotics, your normal gut flora will protect you. You can consider doing probiotic measures, such as yogurt or other probiotics, but in the absence of symptoms (profuse diarrhea, fever), this may be unneeded.