Just like we all have different symptoms with UC, we all have different symptoms with c.diff. I first got c. diff when I was 3 months preggo. I was never on antibiotics so we have no idea how I got it. I didn't feel sick, I had a lot of bleeding and D but I felt fine (even being 3 months preggo). I still worked every day too.
I get c. diff about once a year now and my symptoms are never the "classic" ones, my doctor always thinks my symptoms are from UC but then I'll get tested and it comes back positive. It's hard to tell the difference for me because the symptoms are so similar.