My period is late by 4 days, that's what the app has worked out. I'm not worried because I knew this would happen because I'm late one month and early the next, also typically I'm going on holiday a week from Monday. But what I'm confused with is why the app is informing me that my fertile window starts tomorrow even though I entered info telling it I haven't started my period. It's also telling me that I'm late by 4 days... I'm bit confused by it... Help...😖