OPK newbie

Amber • Wife. Boy Mom. TTC #2. Trauma Nurse.

So my fertile window isn't until Saturday, but I am new to ovulation tests so I tried one out. It has a faint line.. which I know is negative. but does that mean I'll ovulate soon or do they always have a faint line and that means nothing? I've never used them, I got pregnant so fast with my son and this time is taking a while. I'm wondering if maybe the app is wrong? Thanks ladies for any help