Has this happened to anyone?

I am 4 days away from when af is supposed to start. I always have a 33 day cycle. But as of today i have been spotting for 8 days and its either pink or brown. Yesterday and today i had a little bit of light cramping and then this afternoon i start very lightly bleeding (red but still not enough to get in my panties) what the heck? Guess i can rule out being pregnant anyway.