Faint lines not getting darker?

emy

Okay so these test were from last week

This test is Monday

This test is from yesterday (yes I know its blue dye and not pink so hard to compare) the line showed up within the time frame

Then I took a test today FRER and got a another super faint line

So I guess my question is these are positives, or am i losing my mind? Also why aren't they getting darker? I've had 4 miscarriages so I'm just super anxious.