Plan B help?

So I started my new pill pack a week later than usual because I was on vacation and couldn’t pick it up. (been on loestrin for 3 years) Me and my fiancé had sex and he came while he was pulling out. Since I started my pack late and had only taken one active pill I went and got Plan B. Am I supposed to get my period on the sugar pills? Do I continue taking the rest of the active pills in my pack? And is it normal to spot bleed or get your period right after taking it?