I need OPK advice!!!

So I'm using Clear Blue digital opks...today I got a high fertility result (yay!) I decided to do another test, this time with a cheap test ( the strips that you dip) it looks completely and utterly negative, like not even close to being positive. Earlier this month the cheap tests were looking pretty positive but I ignored them because the digitals were giving me a negative result....now I'm so confused - which tests should I trust?! Help!!!