I recently started taking birth control (4 months ago) and everything has been great. My menstrual cycle comes on time every month, and is usually a normal cycle. This month, my period came a day later than usual (which I know is no big deal) but I have yet to bleed. I am only 3 days into it, which is usually when I would have started regularly bleeding, but there is only dark (almost black) kind of dry blood that just flakes. It s really thick and abnormal for me, could it just be the hormones in the bc?