I had another period after a week of having period

Hye, i was a little late for my period. I was scheduled to have my period on the 9-10 November but i was late for almost a week. I eventually got my period on the 15 Nov and my period was as usualit lasted for 6 days. But i was horrified when i get another period after about a week of my last period. It started on 28 November. Is there something wrong with me? 

Pills to prevent pregnancy ?

Yes, i took morning after pills few days after my period ends