Why isn’t the line getting darker?

Remi • 🇺🇸. Baby girl born 12/21/18 🎀

I know I shouldn’t keep testing... but I had a miscarriage so I’m a nervous wreck. I found out on Friday morning. It’s now Sunday (48 hours later) took another test and the line is still not dark! I’d be 14dpo today. I’m worried... shouldn’t it be dark by now?