Help a newbie to IUI! Could this be it?

I am a complete newcomer to the IUI process, after experiencing several early pregnancy losses over 2 years TTC. I was initially interested in the 'science' of testing out the trigger, but.. it seems these lines might be getting darker?

I am 10 days post trigger and they were getting progressively lighter, now slightly darker today and yesterday. Today and 2 days ago for context in pic. I test same time of day, afternoon is better for me.

Has anyone else experienced their trigger giving a more solid result, this long after?

Quietly hopeful.... 🤞