I’m so confused help

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I’m very confused last month my period was 3-4days early & 11days before af showed I had sex n saw spotting afterwards I’m sure I had sex during the big O but this month I’m late so far by 3 days and I use 2 period apps this the first time they’ve ever been correct usually they’re a day apart

How is it possible is it possible like how can I spot 11 days before af n it come 3-4d early n now this month it’s late n I saw ewcm this month too