Post menstrual symptoms?

So yeah, I had my period last Nov. 25 to Nov. 27 and only spotting until Nov. 29. But til now, I'm still being nauseos and feeling sick. And now, I'm 3 days near my fertile windo.

I'm having pregnancy scare, was it really period? But I posted that picture last week and many said it was. Is there someone experiencing pms after period? Is there a thing like that?