A duo is conclusive at 4 weeks so you have to ask them f that was used, otherwise your tests were a waste of time and you need to wait 12 weeks for a non-duo test.
With you saying that which test do you think was used with what I told you?
If it is a 4th gen, it is conclusive.
If it is a 3rd gen, it might not be conclusive. But it is still reliable