Please test after 90 days.
http://www.cdc.gov/globalaids/Resources/pmtct-care/docs/TM/Module_6TM.pdf
Page 11
#4
In an adult, a positive HIV antibody test result means that the person is infected, a person with a negative or inconclusive result may be in the “window for 4 to 6 weeks but occasionally up to 3 months after HIV exposure. Persons at high risk who initially test negative should be retested 3 months after exposure to confirm results
Firstly, low-grade fever is NOT hiv.
HIV experts say 6 weeks is conclusive. 8 weeks to be conservative. The doctors on medhelp say 3 months is based on outdated information.
You're clear.
12 weeks will be conclusive--all the best.