In 99% of the cases normally within 3 weeks people will have symptoms like chancre sore, fever, etc, 8 weeks almost conclusive, maximum window period is 90 days post exposure. you can relax - no worries.
I would say that without any symptoms and a negative test at 8 weeks you're pretty safe. If you are still worried then another test at 3 months would put your mind at ease but I'm confident it would also be negative.