Worried about line progression

I’ve been feeling pretty worried today after my test line is no longer a dye stealer today and looks more like my test from 3 days ago. It was an immediate positive, but still not as dark as yesterdays.

I should be 4wks+5 today. First appt isn’t until 6/1! Anyone else experience this and have it not be a bad thing??

Top to bottom progression all taken with FMU after holding it all night long.

4/26 @ 13DPO

4/29 @ 15DPO (AF due today)

5/1 @ 17DPO

5/2 @ 18DPO

5/4 @ 20DPO