question about fertility window

Sorry this is definitely going to be tmi. I am using a donor for at home insemination. This is my first month trying. The app said my window is the 23rd-29th with the ovulation tomorrow (the 28th). I wanted to inseminate on the 25th but my donor felt it was too early. He wanted me to track using ovulation strips. I tested on the 24th and the test line was very faint. I took another test on the 25th and the line was still very faint. I tested on the 26th around 9 am and the test line was very dark (very close to control line in color). My donor gave his sample around 2 pm on the 26th. I didn't test this morning but my donor came back around 2 pm today and provided another sample. I just tested and the line is faint but noticable. My donor is planning on coming back tomorrow and Monday for another donation. Should he come or is it too late since the test line is faded? Thanks.