Can you use Glow as a birth control method on its own?

Aria

My bf and I always use condoms. This app actually has me more paranoid on my fertile days when it says I have a 25-33% pregnancy chance, but also now I’m less concerned on my non fertile (~3%) days. Im considering going without protection on those low days...do other people do this? Is it a reliable method or have you gotten pregnant having sex on a low fertility day? On a similar note... would it be risky to have even protected sex on a high fertility day?

(We’re tested and std free so that aspect of not using condoms is fine)