Help, not sure which line!

Hi ladies, I realise this may be a stupid question but which line should I be looking at?
Is it the vertical or horizontal line and if it's faint is it still a positive? I'm new at this so please don't laugh.

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