Faint line not getting darker?

Aim
I had a miscarraige last month and when AF didn't show up I decided to take a pregnancy test just to see... It turns out I'm pregnant again! The 2nd line is not getting any darker though (I've been checking every day) and I'm really worried I'm going to have another miscarraige. Anyone have any stories about the 2nd line not getting darker but everything was okay? I'm really scared. I also have no symptoms so that makes me nervous too!  😞 (I did have a confirmed BFN after the miscarraige was over) thanks ladies!!!