Am I pregnant? Or just stressed? help!!

I am 6 days late for my period and am freaking out. I’ve been getting strange symptoms like nausea, diarrhea, discharge.

I had protected sex (condom) 15 days ago. And ovulated roughly 18 days ago.

I took 3 tests in the past week(since my period was supposed to start) and all negative. Is it possible I’m pregnant?