Help!

I'm sorry to post again about the same thing ladies 😕 but... what are your experiences with the clear blue pregnancy tests? I did a test at Sunday lunch time and it showed up with a vvvfl and got darker after the 10m testing window. I did one again today (2 days later) at lunch time also and it showed up with a vvfl within the 3m window but isn't any darker than the one i did 2 days ago. I'm so confused as to why I'd be consistently getting a faint line that isn't getting darker. I thought it may be an evap or just the test line darkening after time but this one came up within 3 minutes so i don't know 😖😖