Question about early testing ??

Christy • I have been TTC since March 2015 . I have had 1 ectopic and 2 miscarriages . Currently on pregnancy #4
Ok so here is my dilemma . Past few days I felt sick so I figured I will take a early response test . It was clear blue digital . I am due in 5 days and it came up pregnant , right after with the same urine I tested with clear blue plus test which is not a early test and that came up negative . I am so confused . I have no clue when I ovulated because I stopped trying to even track .. what do you ladies think? I was going to test again Friday the day before I'm due and see what happens . Could the digital be a false positive ? Or was it positive because it detects early while the other one does not ?