My period lasted only 2 days after taking the morning after pill.. is this normal?

So basically I took thr morning after pill 3 weeks ago, 1 week later I had blood coming out for about 4 days, which was a normal side effect from the pill-bleeding in between periods. Then a week later, so this week I had some discharge for a couple of days and then my actual period came about 4 days early and lasted only 2 days. The bleeding was normal, it was red and i changed one pad a day. So my question is has this happened to anyone else? Is it normal?