Ovulation reading apps?

Abby:)) • TTC my rainbow baby while having Hashimoto’s disease 🌈👼🏼

So I’m currently using Premom and I’ve learned that it will say your test has low numbers if you take the picture automatically, so I’ve been taking my pictures manually. I’ve noticed that no matter how dark my test line is getting my numbers remain low. Is this normal or is the app just not great? I’ve also never tracked ovulation or used any apps like this before so I’m unsure