Why isn’t the line darker?!

F

So yesterday I took a test with FMU, posted it on here because I was unsure and people said it looked like a vvvfl but may be a dodgy test, and to redo. So I did, and there was a faint, but clear line. Then i got poas mad and tested in the afternoon, an even fainter lone! So I checked again this morning with FMU and I’m not sure if it’s a proper line?! All photos taken on the 5 minute timer mark (what the test says)

Test one (FMU yesterday):

Second wee yesterday:

FMU today;