Just curious why when all your tests were negative you repeated your tests.
You were negative you had no reason to repeat testing.
Have the HCV RNA by PCR test this looks for the actual virus not just antibodies. Then you will know if you infected or you are not. There is no reason to have any additional Hep C antibody testing.
Hep C is not generally considered to be an STD although there is some risk primarily for those who have multiple sex partners or those who engage in rough sexual practices like BSDM or blood letting where there could be a risk of hep c infected blood entering the blood stream of an uninfected person.
Hep c is a blood borne virus it requires hep c infected blood to enter into the blood stream of an uninfected person to transmit the virus.
From what you describe you likely were not at any risk. But simply for peace of mind have the HCV RNA by PCR test this will remove any doubt of your status.
From the US Center for Disease Control:
“People can become infected with the hepatitis C virus during such activities as:
Sharing needles, syringes, or other equipment to prepare or inject drugs
Needlestick injuries in health care settings
Being born to a mother who has hepatitis C
Less commonly, a person can also get hepatitis C virus through
Sharing personal care items that may have come in contact with another person’s blood, such as razors or toothbrushes
Having sexual contact with a person infected with the hepatitis C virus
Getting a tattoo or body piercing in an unregulated setting
Hepatitis C virus is not spread by sharing eating utensils, breastfeeding, hugging, kissing, holding hands, coughing, or sneezing. It is also not spread through food or water.”