Good Morning again,
Good, I'm glad you have relaxed a little. You are not at risk from these activities.
With reference to the test you said:-
I got tested at 4 weeks and 6 weeks, all negative. These are rapid tests by taking blood from finger, get the results within few minutes (one blue dot negative and two blue dots positive).
This sounds like an INSTI - I don't know of other tests which are constructed or behave like this.
You can see a You Tube Video here of the INSTI being performed
An INSTI is a third generation test - an excellent one, but a third generation test. For more details I'm afraid you will need to ask the person who performed the test on you.