Pregnant and spotting

Patient: I’m 12 weeks pregnant and I had a very bad cold for the last two days, my symptoms included dizziness (feeling faint), sweating, loss of appetite, diarrhea, migraine, nausea. This morning I woke up feeling fine but I found out I’ve had some spotting, I had my 12 week scan today and everything seemed OK but I’m still spotting (it’s been like this all day) and I’m really worried there’s something wrong with me. My midwife doesn’t seem to think it’s anything but could there be a chance that I have contracted listeria or something else that would cause this?