Late period.

My period last month was on the seventh and ended on the 10th. I am five days late this month for my period and I have all the symptoms like I’m going to start but no period.
The last time I was sexually active was June 25 and I’ve taken five pregnancy test and all of them are negative
I am going through a lot of stress with my grandma having dementia and other things going on. Could my late period be stress?? I’m so scared.