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4th generation test at 40 days

Hello there , I hope all of you are doing well
My question is I had unprotected vaginal sex with a unknown status girl and I waited until 40 days then it came negative is that conclusive or should I wait for 45 days ? The test was 4th generation
Thanks in advance
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20620809 tn?1504362969
Yes, 4th generation tests are conclusive at 40 days. The result doesn't change when taken at 28 days and beyond.
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