Clear blue pregnancy test 2nd lines after 10 minutes

Hi all,

I’m getting so frustrated with tests at the minute 😫😂 So I did some cheapies and could see extremely faint 2nd lines, So I got 2 clear blue 6 days earlier tests to confirm it or not and both of them looked negative within 5 mins of taking them, but 10 mins after taking them theres obvious 2nd lines… by obvious I mean my husband saw them straight away 👀😂

Obviously I’m not now saying I’m pregnant because it’s outside the “time frame” but why do they do this?! xx