I'm not pregnant I've taken several tests no symptoms either EXCEPT for the late period.. its very late now... the only other thing is I have a bad pain in tummy not a cramp just a pain and not lower down where periods pains are but all over... which I'm assuming is from stress.. could my periods be late because of this as well

There are a lot of things that can factor a late or missed period... stress can be one of them.. when I went through basic training I know a lot of females that didn't get their periods for months that normally had them like clockwork.. but a call to your obgyn might settle any concerns you may have.