You really shouldn't take that test sooner than 10 days after a risk event. Test again to be sure. In most places, the RNA test is pretty expensive. If you wait until at least 28 days after the event, you can get a 4th generation (Ag/Ab) test at a lower cost, and it will be conclusive.
Has it been 28 days as suggested? No. So, wait 28 days for the 4th generation test or you are wasting your money. A one time unprotected vaginal sex encounter is less than 1 percent risk. No more questions until you meet the window period and test then. take care.