Late period

We’ve been trying to conceive since January! Periods have always been consistent, varying a day or two apart. I should have started around the 10th. Took a test on the 12th it said negative. Still no period but light cramping that only last a few minutes at a time! Going to take another test tomorrow and see!!! My question is can just thinking about being pregnant throw off your period? I haven’t been stressed but i have been thinking about it constantly so don’t wanna get my hopes up !