Faint positive or indent line?

I have had tests for 2 or 3 days that look like this is this a faint positive or just an indent line? And should it be getting dark if it is positive? Thanks guys!!

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors