What is this dip??

I’m 6 DPO. I don’t use this app or Premom for AF bc they are always off by a few days. So the app I do use that is spot on, she isn’t due til the 20th. But she better stay away. But is this dip normal at 6 DPO? I have no symptoms really of anything? Waves of quick nausea and quick twinge pains and random slight cramping but only last maybe a couple minutes if that. And super tired. But that could be the stupid time change. Thanks ladies!!!!

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