Yes you can get a doctor to answer you if you post in the Expert Forum and pay their fee.
Can a doctor answer my question please?
The window period is 3 months and has been since 2004.
So is there anything that may have influenced my results?
The window period is 4 months.
http://www.bhiva.org/documents/Guidelines/Testing/GlinesHIVTest08.pdf
Post testing
Page 11
The need for a repeat HIV test if still within the window period after a specific exposure should be discussed. Although fourth generation tests shorten the time from exposure to seroconversion a repeat test at three months is still recommended to definitively exclude HIV infection.