A little confused.

Hi I'm new to the site and I've never posted before please bare with me 

I was taking cerazette for 6 days and stopped felt awful on it, I know I should have finished the pack but I had terrible headaches which I never had before. 

I didn't get a withdrawal bleed until 2 days before my period was due. It was very light only when I wiped there was some discharge with pinkish reddish blood lasted 2 days on and off wouldn't fill a pad in the two days. 

I was just wondering when should my period come? And is it normal to have a withdrawal bleed so late. 

Thanks x