My Period won't show

My period is ALWAYS on time and occasionally a couple days early. Well of course because we are on a HUGE time constraint, my period has chosen to be late. I NEED it to start in the next two to three days to make this cycle work. And its making me crazy. I am getting hot flashes, I am moody as hell, and just plain stressed out because of it. Its so frustrating.

I took a test yesterday and it was 100% negative. I have never had a false negative on a test and two accurate positives, so I believe the test, but my heart is in my throat and I am on the verge of crying because I just want my period to show.

Who would have thought I would ever wish for a period.