The window period isn't 6 months, ever. Generally 6-8 weeks is plenty of time for blood tests to turn positive, rarely 3 months, never longer. Your negative result at 4 months is proof positive you weren't infected. You don't need any further testing.
Best wishes-- HHH, MD
Now its working - never mind.
AJ
This is strange. His post shows up in the experts forum, but when you click on the link, it brings you here.
AJ