Line progression HELP!

Hi, so this is all new to me as I didn’t have this problem with my first child. I got a positive at 15dpo, very late if you ask me. Especially when I compare it to my first child.

Anyway, the top test is 15dpo and the second 17dpo. Is this something to be worried about? I feel like the line isn’t getting darker and I’ve already had a miscarriage before. Don’t want to get my hopes up for it to be ripped away from me 🥺😭. Anyone else experience fainter lines at this stage and go on to have a healthy baby? Only asking because in my previous pregnancy at this stage, the line was extremely dark.