Jet Lagged and Curious?

I am on a trip right now in LA and I normally live out East. I was supposed to start my period Monday, but it’s now Friday and still nothing! I’m having all of my symptoms of when I have my period but the blood just won’t come. I am sexually active so it’s really stressful to have it be late. I took 2 pregnancy tests already (on Wednesday and Thursday) and they both came back negative.

I’m a really paranoid person by nature, so has anyone else had any experience with periods being late because of traveling?