there are three possibilities for your bleeding,
1.morning after pill can cause menstrual irregularities,
it can prepone or postpone the periods depending on when you took pill, means either before or after ovulation.
as you took the pill on 11th day of your cycle, that is before ovulation so it might have preponed your periods.
in this case you will have your periods after around one month.
2.as the side effect of the pill also bleeding can occur,
in this case you will have your regular periods after 2 weeks.
3.anyhow if you if you do not get periods at your expected date better do urine pregnancy
test once to rule out pregnancy as there is 1% failure rate of the pill and it could be implantation