Opinions? Has anyone went through this before?

Last period started on July 3rd, my periods are a little unpredictable as they are quite irregular. Anywhere from a week early to almost 2 weeks late at times. Been that way for years so its the norm. I use a couple different period tracking apps to kinda keep a better idea of estimated start dates and ovulations, etc.

So now I'm between 17 and 22 days late. Took 2 pregnancy tests yesterday and were both negative. Still no physical signs of period starting like I normally get, and not really any other signs of early pregnancy except fatigue, slight dizziness, and occasional upset tummy. But I'm also stressed cuz I'm getting ready to start a new job and my wedding is in 3 weeks.

So, do you think stress could just be causing my period to be later even more than usual or at this point could the hormones not be elevated enough to read?

Ttc for over a year now...