Second morning urine better than first?!

Anyone find they have darker tests when not using fmu?! I don’t know what to think…

I’m wondering if anyone in here is able to help me at all?? I’m 9dpo today (poss 10) and have been testing since yesterday. Yesterday AM on a FRER my line was barely visible with fmu. Today (below) it’s a little darker but still v.light. The cheap test was dark yesterday at 5:30pm but fmu at 5:30am today was basically negative. Tested again at about 8:30am with second urine (no fluids in between) and got a dark positive again.

Anyone experienced anything like this?

Thank you 😊