Hi, if I used a towel with a shit stain on it, what are the chances for stds and how severe?

I had sex with an escort who gave me a blowjob without a condom on. After sex, I had a shower and I used a towel to clean myself, which turned out to have a shit stain on it. I’m mainly concerned with the fact that I may contract an std from a shit stain from a towel