What do you trust more?

My last day of my period was the 17th. I normally have a 35 day cycle (and yes, I know the app is just a guess), but I’m not scheduled to ovulate Until May 9th. I started testing with ovulation strips and it’s negative, but today, I have creamy white discharge in my panties (and I thought that meant fertile discharge. Please correct me if I’m wrong). If my thought process is correct about the discharge, what would you trust more. Strips or discharge? Or something else?