I recently used one of your tests and before doing so I washed my hands then used an alcohol wipe (thinking i was doing the right thing). I then proceeded to the test. From what I remember, I pressed hard on the spot when I used the lancet. I got a good amount of blood and instead of wiping the blood away, I used the first drop of blood. My test came out as negative. Could it be that my test has been contaminated or if it was the case, the test wouldn’t show any lines? The last sexual encounter was in March. Thanks for your help.