Reasons For Late Period And Brown Spotting

Patient: Hi I had dark brown spotting very light for a few days prior to my period due date which was friday. I took a pregnancy test the day after and it was negative still no period the brown spotting has stopped and I am now 2 days late for my monthly I am confused not sure what the spotting was or why Im late could I stil be pregnant?

Symptoms: Spotting,no period