Nope he hasn't - somehow Will has fiddled with the results. Kris and Jessica go for further tests, and I think on Thursday the results come back to say they havn't got it. Not sure what Will's motive was, other than to just mess up all the other's lives!
How unrealistic is it though that you can just walk into a clinic and change the results on a computer without anyone noticing and no cameras or anything to see him doing it!