Should I have a darker line?

Marissa • I have 2 girls, 12& 7 and my rainbow baby boys 5 and 2. 2 mc, 8/14 & 1/15.
I am 4w2d (hpt this morning, 2nd pic) got my faint positive on 3w6d (1st pic below). I got my hcg tested on Friday and it was 40, going to get testing again tomorrow morning, but just curious, should my line this morning on my hpt be darker at this point? I definitely think my levels are trending up but I'm worried it's not enough. Thanks!