Let me apologize for replying to your question although my reply was not requested.
You're testing 84 days after what, exactly? If the above mentioned "exposure" is the only thing you have done to put yourself at risk of contracting HIV, then it really doesn't matter whether or not you wait 6 extra days. There was no risk. Your result will be conclusively negative. There is no way you could feasibly have contracted HIV in the manner that you describe. Put an end to your HIV fear