So my period is about 13 days late according to this app so I waited for my cycle to come never did then 2 days ago I had some creamy white cm mixed with a little brown blood/discharge so I thought maybe this is the start of AF but I have been lightly cramping nothing else so today I decided to get some tests and a faint line popped up immediately is this accurate or is it wrong 13 days late shouldn’t it be darker than that