Missed period negative pregnancy test

Hi everyone.

On November 11, I wiped and it was pink discharge. But my period never started. My period usually starts the third week, which should have been the 19th but nothing happened. The whole week passed nothing happened. Now, it is the 28th and I took a first response pregnancy test and it reads negative.

Is it possible that I am still pregnant?

I just want to chime in that I am regular and have been regular with my cycle for the last three years.