Stress or actually pregnant?

Okay so ive missed my period already by like 1 week now. I have taken a test but it was negative. I have no symptom of being pregnant but I know theres still a chance. Im saying it might be stress too because I recently went through the death of my older brother and with all that.... my parents are lossing it and since ive staying with them since it happened me and my fiance haven't really been trying. Should I just wait it out or go the doctors?