8 weeks ago, I had unprotected oral sex and protected sex with a CSW, 1 week ago, I had unprotected masturbation with another CSW. I took a test yesterday and it came back negative, which should exclude the risk of my first exposure, but I also want to take another test to exclude my second exposure (unprotected masturbation), I want to take a 4th Gen combo test, when is it most accurate? Is it 4 weeks most accurate?