Period shorter than normal.

My periods have always been 5-7 days long and very heavy flow. The last two months my period has lasted a total of 2 days and is super light. I am 25 years old. I scheduled an appt with my gyno to see if she can give me some insight on what's happening to my Body but it's two weeks away and I am driving myself crazy trying to figure out what is happening to me. Does anyone have any advice or personal experience with this problem?? What could be causing this?