There are no known cases of HCV being transmitted through oral sex on a man (fellatio) or a woman (cunnilingus). However, it is theoretically possible that the virus could be transmitted this way if a person has mouth sores, bleeding gums, or a throat infection.
From:
Hep c association org
This would mean that the virus would need to reach your bloodstream the bleeding gums if you just had a tooth pulled xcetera otherwise it is usually transmitted via a blood stick such as an IV stick getting a tattoo or having a blood transfusion prior to the early nineties.
It's quite easy to ask your doctor for a simple CBC CMP and liver Panel test these days without his or her objection.
That is to say a complete blood count a comprehensive metabolic panel and of course your liver panel elevated liver enzymes will lead your doctor to do further testing but the chances if your Contracting hepatitis C through oral sex unfortunately Slim. ( I am not a doctor nor do I play one on TV simply advice)