Help (MAP)

I realise this is probably the wrong thread. I also realise most of you are ttc. 

I took the MAP (morning after pill) on the 16/12/17. My last period was on 2 /12/17. Yesterday I started bleeding a week before my expected period due on the 31/12/17, however it is light and varies between brown discharge and bright red blood. Started off really heavy but now barely enough to fill one tampon. Should I still expect my period or is this it? Could it be implantation, or just the MAP messing up my cycle? Sorry I'm new to this- first (and last) time taking this.