Pregnant or not?

Currently 14 days late but on day 10 i started spotting the brown blood but very tiny bit. I could have used 1 pantyliner to cover all the blood released (just to show how little i spotted). This has never happened before. I took 3 pregnancy tests. One when i was 7 days late and the other 2 once the spotting began. All came back negative.What should i do?