Help??

Hey y’all ! So yesterday (two days before my period) I started having brown cm. Not a lot , I thought it was my period starting, but then again I don’t have brown period blood until after my period. I put a tampon in and went to bed , next morning I woke up and took it out and there was only a little tiny bit of dried blood. My periods are EXTREMELY heavy. But the past week I’ve been having cramps in my very lower stomach, and I don’t cramp until my period comes. I’m really .. confused. I don’t know how sporting works or when it happens, do you think this could be it ???