AF is suppose to start today (31 CD, 14 DPO). I usually start in the morning and no sign yet. Took a test yesterday with a BFN. Last night I woke up twice from awful cramps...which I never get. Felt really wet this morning and thought for sure I'd started but nope. The TMI part is this morning my stool was almost black. Which I read could mean blood in my stool and I need to go to the ER. I am not concerned just yet. Anyone else experience this? Could this be a pregnancy sign?