Period problems!! Help?

So I need some advise, my period is very regular and always super heavy. I started getting mild cramps on the 10th, on the 11th I was fine no period no cramps, the 12th I used the bathroom and just a little bit of brown blood was on my pantie liner so I figured my period was coming any minute but all that I keep seeing is brownish blood nothing like a reguler period for me like I stated before my periods are very reguler and always super heavy and I also have very intense cramps anytime I'm on my period. What could this mean?