I wouldn't worry about it. If you were recently "infected" and as some of the other comments here are claiming the antibodies are "building up" - you would have an acute case that would be accompanied by symptoms or at least something like elevated ALT levels. This is a test that should be banned, IMHO because the anxiety causes more harm than the test results. Hep B chronic carriers, however, really should be informed of their status.
Really, Hep C is not a sexually transmitted disease. The drug industry has basically talked it up as a way to get the AIDS activists on the Hep C bandwagon and sell testing and drugs through their existing astro-turf activists in service to Big Pharma. It shouldn't even be in the STD panel, and it only ended up that way due to the regulatory capture of guidelines bodies. The CDC will say "HCV sexual transmission is rare" - really, it's non-existent, and they know it.
The small change in number is simply test variation. It has no significance.
It can take up to 12 weeks to develop enough hep C antibodies to develop to reach testable levels assuming you have a normal immune system. If you are immune compromised as in the presence of co-infection with HIV or anti rejection immune suppressing medicines it can take as long as 6 months for enough antibodies to rise to detectable levels.
So any testing prior to 12 weeks post a concerning exposure is simply a waste of time.
Hep c is principally a blood borne infection and relatively difficult to transmit. Most often hep c is transmitted by sharing of IV drug equipment between drug users.
Did you experience a possible blood to blood contact with blood known to be infected with hep c?