No standard drugs would mess up the test. If there were drugs that would affect the test, they would be listed and the tester would have to ask if you are currently taking medication. 10 week negative is nice. What was you exposure again?
10 weeks is a good indicator. 3 months is said to be conclusive. chances of a 10 week negative turning positive in 2/3 weeks is close to impossible, but why risk the conclusive. It is your life! Live it Knowing!