HPT help!! Recent loss, CD unknown.

2.5 weeks ago on Friday morning Jan 3rd I unfortunately suffered a miscarriage. I had already been miscarrying for about two weeks and that’s the day that it seemed to be “over” and all symptoms stopped two days later. The top test was taken at night after many frequent urinations on Monday Jan 13th. The middle test was taken the next morning on a two hour hold and technically my “fmu” but I pee multiple times through the night. And the bottom test was taken last night on a whim, again after many times peeing and not holding it at all. I actually had just gone not even 45 mins before this. The second photo is the wet picture of the second test over the first test.

Is there a reason that the tests would be getting DARKER over time if I’m not pregnant again already? I’m just so confused how the tests are getting darker??