New to the pill

Hi, so it is my second month taking the pill and I'm still a little confused. Last month I got my period the third day of taking the sugar pill and it was very light and lasted about four days. Today is my second day of taking the sugar for this month and I was wondering if I will get my period on the third day again. Is it always going to come on the third day or is my body just adjusting? What day is it normal for my period to start? Thank you!