Blood work

I had to get blood work done for genetic testing on baby. The results of some of tests came back for me personally,not the baby. It was the hep c test and the results say “reactive”. Has anyone had this? Before people make assumptions I’ve never done any drugs or touched a needle so I’m so confused on how I would get this. I’ve been bawling all day at the unknown and the fact my baby could get something that I didn’t know I had and never thought I’d have. I feel like a bad mom because of it and it just pisses me off because idk how I could’ve gotten it.