Ovulation Question

Bri

Hi all! This is the first cycle I’m testing ovulation and today the digital test said I’m in my high fertility window, but all of the apps have my ovulation day will be around the 31st. Since I haven’t used the digital tests yet I was just wondering if anyone else has had a high fertility so early before their estimated peak, or if it’s more likely that the apps are off. Thanks in advance for any feedback!