False negative Clearblue Digital test??

Katie
So I've taken 3 tests today; 2 Clearblue and 1 Clearblue Digital with week estimator. I got a faint line on both of the regular Clearblue tests and then a "not pregnant" result on the Clearblue Digital... What the heck? Has anyone else experienced this? Could it just be too early in my pregnancy for the digital test to detect?