Trying to conceive, ovulation test help

I've been trying to conceive after my miscarriage and so far I believe no luck. I decided to buy an ovulation test today, because by my glow calendar today was my highest to conceive. I had a faint line under the control, and I was wondering if I missed my ovulation and that line is just detecting a little LH from preceding ovulation, or if that faint line means I'm fixing to be ovulating..