3 months is conclusive and has been since 2004.
An Elisa test done post 3months mark after your initial exposure with no exposures in between will be conclusive about your status. Since you are in India. the guidelines is 6 months as per south Asian bodies, but u can absolutely trust any result thats post 3months mark. Also since u have said your encounters are post 8 months. u have covered the longest window period. Test is the only way to know your status, not symptoms.
if you want to know your status...then you test...it's as simple as that.
a test done now will be reliable and conclusive.