2DPT and a darker hCG line?

This is my first cycle using Femara, Pregnyl and progesterone suppositories. Has anyone else that’s taken these notices their hCG tests get darker a few days after the trigger shot?

I had my trigger on Monday, 12/9 and took an opk and hCG test the next morning. My opk was positive and I had a positive line on the hCG as well. I was wanting to track the hCG line everyday to get an idea of how long it will be in my system (I know they say approx. 14 days) just in case it doesn’t happen this round. I want to know what to expect next round.

But I noticed that yesterday’s hCG test is darker than the one the day after the trigger. Has anyone else noticed this?