Lines not super dark

Anyone start with super faint lines and end up getting a positive digital but all their line tests never got super dark? I’m not positive on an exact date for when I’m due for my period as my cycle goes between 26-28 days which would put me getting my period between today and Monday. Started to get super faint positive on Thursday and did not get my first positive digital test until this morning with first morning urine, but my lines are not getting super dark. I didn’t have this issue with my other 2, my lines seemed to get a lot darker each day I tested. I’ve taken 8 tests and will picture them below in order, top being the very first test I took not all the test were taken with FMU either. (obsessive, I know, but I was getting negative on the digitals and I’ve been reading terrible things about the first response and indents so I wasn’t sure). Does it matter that the lines aren’t getting significantly darker yet? I’m assuming I ovulated a little later and that my period is due on Monday since I just got a faint positive on Thursday 🤷🏼‍♀️