Has anyone else experienced this?

So my period has come around the same time for months. Now 10 day off track. I felt like I was going to start my period around the right time. & sex didn't start it like it usually does when don't near its start. Then the feeling was gone.
It hasn't come back & I keep feeling nauseous when I get hungry.
Has anyone else had this happen? What was tha cause?

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