Yes, it would have been mentioned, and a followup test would've been required.
You took the right test at the right time and got a 100% definitive result.
Non reactive equals = Negative
You probably had a 4th generation ((DUO)) test. At four months even if you'd had a 3rd gen test it would be 100% conclusive.
Either way, all you need to know is that you are conclusively negative.