Lines not getting darker?

Kaitlyn

I know I’m probably taking too many tests, but my first appointment isn’t for another week and I’m so scared of something happening. I feel like my Frers aren’t showing much progression past 11 dpo. Today’s doesn’t seem very dark to me for being 15 dpo. I think the cheap hcg strips show a decent progression. Is it normal for it to take a while to get really dark results in a frer?

Thanks for any advice or input! I really appreciate it.