ovia app vs glow app

ailie • I`m 21, been ttc baby number 1 for 3.5 years, I`ve got stage 4 endometrosis. keeping hopes up each month <3
well my ovia app says my fertility score for today is 9.0 but my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says I've got 22% chance of conception today....confused 
help please