Line getting lighter? Oversaturated??

[Disney1818]

okay, so i got my bfp October 13th. It was pretty dark but not as dark as I wanted so I waited a few days. I tested yesterday afternoon and got a nice, dark line. I tested again this morning with FMU and my line is SIGNIFICANTLY lighter than yesterday’s line. I know, I know, stop testing. But I just wanted to see a progression after a loss. I did feel like i held it in the pee too long. Does anyone have experience with an over saturated bfp??
The top test is yesterday afternoon
The bottom test is this morning fmu