is it normal that Eve predicts my period will be late this month

so im not really regular like 28 day straight, the latest I've ever been was 8 days and it was last month, due to stress of pregnancy scare I believe. but when I counted on my own 28 days starting on the first day of my last period, I counted January 1st as my first day of my next period but <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says my period is due for the 4th, which means I'll have a cycle of 32 days this month, according to the app. and idk when I should consider myself late if I don't get my period january 1st?! being irregular is so stressful and confusing🙄😖