Hi, I Am A 19 Year Old Girl And I

Hi, I am a 19 year old girl and I took an emergency contraceptive a week before my actual period date. My period has now began early by 2 days. first day it was very light I just found blood on tissue not even the pad, the next day it was normal bleeding but it stopped to be like that in the evening again and went back to the way it was on the first day. should I be worried ?