Clearblue digital with weeks estimator

Has anyone ever taken a clearblue digital pregnancy test and then taken it apart? I did this today. If I am it would only put me at 7dpo. The test said not pregnant but I have had faint positives on other tests. When I took it apart I saw two faint lines and a dark control line. Has anyone ever taken it apart and saw lines and it be negative? I have seen conflicting information about these lines all over the place. TIA