If you are an investor, you might want to think twice before purchasing the shares of Cree, Inc. (NASDAQ:CREE) or Agrium Inc. (TSE:AGU). According to Jim Cramer of CNBC, the pre-announced earnings of Cree is a clear indication that the company isn’t doing well. Cramer said that the fact that Cree, Inc. (NASDAQ:CREE) has projected…