my husband had a vasectomy almost a year ago. I am one week late as of yesterday. I have had cramping through out abdomen. Have gone to the potty guite a bit both 1 & 2-haha. I took two test yesterday and today and both came up negative. Does anyone know of any thing else out there beside pregnancy that can cause period to be late like this. I am no more stress now than I normally am. I have a pretty regular 28 day cycle. Any thoughts??? Thanks!