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.
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.
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.