Thank you for your inquiry. From what we gather from the question, you were asking about the conclusiveness of a fourth generation HIV test at 8 months.
The window period for a fourth generation test is up to 6 weeks (1). If you haven't had another possible exposure within the window period, a negative fourth generation HIV test is considered conclusive after 12 weeks (2). With your two negative tests both well after 12 weeks you can be completely confident that your test results are accurate.
Recommendation: No need for an HIV test with the scenario provided, refer to a healthcare professional for other health related questions.
AIDS Vancouver Helpline/Online, Rashell
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1.) CATIE HIV Testing Fact Sheet
2.) CDC HIV Testing Basics