Chemical?

I tested on the 23rd and got a vvvfl that is only visible in person really, since then I’ve tested every couple of days and the test got a little darker the next day but has stayed the same since. I’m 16 days post ovulation and apparently 4w2d and am assuming the fact that my lines are still so light is not a good thing. With my daughter they were super dark by the time I missed my period and with my miscarriage at ten weeks in October they were definitely darker than this. Anyone else get this? I’m not bleeding or cramping at all but I’ve prepared myself for a miscarriage.