Hi archallaa, 12Step Guy is correct in saying that you would test positive to having Hep C antibodies if you had been exposed to the virus at any time and you had spontaneously cleared it.  On the other hand it is sometimes possible to receive a `false positive` result and I expect that`s why you need to have the test repeated.

If you do have Hep C you would have caught it by blood to blood contact with someone, you certainly would not have caught it from having oral sex and it`s highly unlikely that you would have caught it by having any sort of sex.  Jill

I'm not a medical expert, but I know folks who were exposed to Hep C, their bodies fought it off and now are left with the antibodies , maybe others can comment? 

Hello.

So, here is the history behind all of this. 
4 weeks ago i was with a girl that i had
sex with. I used condom during the vaginal sex
but not during the oral sex (that she gave on me).

She has chronic hepatitis b with very low infectivity,
but since im a little bit paranoid i decided to go and
get vaccinated and tested against it.

At the hospital they tell me that from what i told them
the risk for me to be infected is very, very small, but still
i decided to get vaccinated and so i did. I also took some blood tests. 

I took the blood test and went home again. about 2 weeks later i was back at the hospital and they showed me the results of the previous blood test. 

I do not remember exactly what the test was called (but im sure someone here knows it) but the test showed me:

Hiv: negative)
Hepa*** B antibodies: negative
Hepatitis B virus: negative
Hepatitis C antibodies: positive
Hepatitis C virus: negative (Think this one was called HCV RNA)

The girl i was with has not in any form Hepa*** C, and
i have never been in contact with any kind of drug abuse
or anything like that in my life. The doctor tells me that we
should do another blood test (which i will get the answers on in next week) and then he asks me a couple of questions.

From the answers i gave him on the questions he tells me
it is extremely unlikely that i will get an answer on the next blood test saying i have hepatitis C at this very moment, and from what i told him and from how my history has been they also said that it's very unlikely that i even had hepatitis before in my life, which makes the hepatitis C antibodies: positive result to seem very strange. 

Any ideas of what could be going on here?

it is very unlikely that my next test shows
I suddenly also have the virus, so maybe I should not worry about,
but how can it be that I have antibodies against hepatitis C if your test is correct, when it infects so very poorly through sex.