Hello
In your case , you doubted that 
Hepatitis "C" transmitted through sex or not .
After going through many studies I  would like to say that there is not a chance that you got HVC .
Now read this brief study for your information:
Patients at risk for hepatitis "C" include persons who have ever injected illegal drugs, have received 
hemodialysis , or were born to an infected mother ( perinatal 0 , health care workers who have sustained needlestick accidents are at risk.
I mentioned ( however this is not for you ) so that you can understand that sexual act don't transmit HVC.
This is clearly mentioned in the book ,that there is no other way of transmission of  HVC , so surely you didn't get any HVC infection by this sexual act .
Alt high level may be due to alcohol use , so need not to  worry .
Hope this will help you.