Advice please! Just have to wait? (TMI!)

So AF is due today. Had very bad stomach cramps that felt like period cramps since Thursday too. Yesterday evening I did a CM check and there was a light amount of brown mucus. I don't usually get that before AF which is strange, usually v. heavy flow from the start. Nonetheless it had that iron-like smell (tmi) that usually AF has. This morning stomach cramps bad enough not to be able to work and yet still nothing and the day is almost over where I am. CM check and either nothing or v. small amount of whitish mucus plus no AF signs or smells. New to TTC but never experienced this with AF before... HELP! Obviously the best thing is to wait and see but I'm anxious! Any ideas?