While there remains debate about when an HIV test can be considered 100% conclusive, the vast majority of HIV specialists and organizations such as the CDC, the NIH and The World Health Organization all hold to the standard of 12 weeks (84 days) as confirmatory for a negative status.
You tested out to 42 days (6 weeks) which many experts will say is a good indication of your status, but it is not CONCLUSIVE until 84 days.
I recommend testing again at 12 weeks.