Hep c is a blood borne virus. It required hepatitis c infected blood to enter the blood stream of an uninfected person. Hep c is most commonly transmitted through the sharing of IV drug needles or having had a blood transfusion prior to 1990 when antibody testing was developed and the blood supply secured.
So in answer to your question about hep c risk the answer is no you are not at risk For HIV you could ask in that forum but they will very likely say the same, zero risk.
Hepatitis c infected blood must enter the blood stream of an uninfected person for transmission to occur
ZERO RISK
What I mean by directly is hepatitis c must enter your veins or arteries it must get inside your blood stream. While test is evidence of hep c in saliva hugging, kissing,, breast feeding, sharing drinking glasses, eating utensils, coughing and sneezing are not methods of transmission for hep c.
If you shared IV drug needles you would have a greater risk but not guaranteed to contract hep c. Or if you received a blood transfusion before 1990.
Nothing you have described is in general a risk. While having sex with multiple partners especially when engaging in rough sexual practices like BDSM or blood sport involving the intentional letting of blood would be a risk I very much doubt you engaged in anything like that.
Hep c is difficult to contract you are most likely not at risk your antibody test will very likely be negative
I have no professional advice I am a patient who had hep c for 37 years until I was finally cured with Harvoni. I do not work in the health care field. By trade I am a mechanic.