Help - is this a bfp or a faulty test?

Lizi • 33. Pregnant with our first.
Hi I'd be really grateful if you could help. I took this test this morning. 11dpo. My period is due in 3 days but I've had such killer back ache I thought I would test. The control line came up right away but then this second line came through faintly a few seconds after. Is this a faulty test? Thanks 

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