Oh @BlondeinBrisvegas you do make me laugh out loud!!
I mention the new box of FRERs because I cracked open a new box lastnight. At 8pm I got 5% of a grey 'shadowy line' (for want of a better word), 8am today (when my urine sucks) was still about 5% and 11am it's about 10%. It's absolutely and utterly certainly not a straight forward grey line that always comes for me pre pink line. That's why I suggested that maybe this new box has a deeper indent line pressed into it.
@Bongley It seems that I'm peeing every 3 hours. So yep, like you, I'm testing far more frequently that I'd like to admit to!