I took a test on Tuesday afternoon after holding pee in for 4 hours and no water (left)

Wednesday morning I took another test and it went lighter so thought it’s just trigger leaving.

I have assumed that my FET failed. I have my beta tomorrow morning. On a whim I tested this afternoon (10dp5dt) but I had drunk about a litre of water and only held it for a couple of hours (right one). I was expecting the trigger to be out but I now think it’s darker than Wednesday morning (middle) . Am I clutching at straws?

Should I be concerned that it’s still so faint?