Which to believe?

Lei

Hi all! I use glow and Flo for tracking... my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says my ovulation is in 6 days, and flo says it’s in 11 days. If I’m not using test strips/temping, how do I know which is most accurate when they have the same information?