Double Period?

Kayci
Hello! 
I was diagnosed with PCOS, Nov. 1st 2016. Dr gave me med's to induce period and i also take metformin, I got my first period in three months on November 16th and it lasted until the 21st/22nd. I just started what seems to be another period today December 1st. I do have a doctors appointment tomorrow but I was wondering if this has happened to anyone else? Or any advice on it.