How accurate is Glow for you?

So Idk if its just me, but Glow honestly sucks at tracking my period. I've been using it for 6 months now and it's wrong on every single period. I'm not even that irregular! My periods are always 1-2 days off but my ovulation period is literally off by weeks! I fill in the daily log and report cm but it still doesn't change anything. I really just want a tracker that works but unfortunately I'm kinda addicted to these chat boards. Are there any other apps that might work for me? How accurate is Glow for you?

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