I agree. Go ahead and take a duo test now. It would be accurate. Don't monitor your symptoms though like sore throat. HIV is never diagnosed by symptoms as Tom, Dick and Harry gets sore throats and the like at random and it has nothing to do with sex or HIV. A one time exposure is less than 2%. Use a condom always in the future.
Your test was too early so it was a waste of time.
Any test is conclusive after 3 months, so you can take any test now for a conclusive result.
Symptoms can't prove anything so don't worry because you are sick. The only thing you ever need to do when in doubt is take the test instead of studying symptoms.