I took a morning after pill 3 days after my last periods and a week later i got my periods again, is that normal?

Periods with Plan B: Periods can get very off schedule with the use of Plan B. If you took plan B within 48 hours of the incident, then it is very unlikely are pregnant. Don't be too concerned though, about unusual timing of periods and/or timing of bleeding after using Plan B. You are supposed to bleed with Plan B and the timing is usually very off from your normal schedule.