TTC no 2. Had very slight spotting on Friday (i.e. 3 days ago) which I hoped might have been implantation? Period is due in 4 days, I know I should wait but just tested with Clearblue and am not sure if I'm imagining a very very faint line whether the positive should be, is this possible if implantation did only happen 3 days ago? There's no-one around I can ask to squint at it up to the light with me - DP is away till tomorrow night. I should have held the stick up to the light before using it - do Clearblue have faint shadows anyway where the lines will be once it's used (I mean when fresh out of the pack)?