I am five days late for my period, have cramped on and off which I never do unless I'm bleeding, and have been beyond exhausted to the point of not being able to function. I've taken a test the first day of the missed period as well as the third day using fmu but I keep getting bfn. I've used different tests both times one blue dye the other pink dye. Any one have any ideas why id be so exhausted ? I'm not stressed (unusually at least ) or sick.