I agree with the others, this sounds like a faulty test and therefore the result is null and void. Get another test to be sure.
I agree, take another test that one was faulty. Never recheck pregnancy tests after the time limit. They have a tendency to turn positive after so long.
If nothing showed in the control window, then the test is faulty. Tests read after the time limit are not accurate. To clear it all up, I would take a digital test and read it within the time limit on the test.