Anyone due today but glow change it?

Kayleigh
So I was due for my af today but she's not arrived just yet glow asked me if I'd started my period I clicked no so then it's moved me another week is this normal?? Also i only ovulated last week so surely glow had it wrong in the first place?? My last period was 14th July and I'm 28 days cycle 😒 very confused 

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