Stress / Period?

So I'm supposed to start my period around the 14-15th of this month & even though I'm fairly certain I'm not pregnant, will me stressing about pregnancy & impatiently waiting for my period to come cause enough stress to make my period late? obviously I have a few more days until I should start, but I've taken 2 pregnancy tests & both came out negative. I'm just hoping my period comes in time so I can stop stressing!