Bleeding 3 days after period ended

Hi ladies. I had my period for 8 days (which are normal for me). It started from heavy, to medium, to very light flow and to no blood. Then it completely gone for 2 days, and then on the 3rd i started to bleed a lot. It continued for 4 days and the flow is just like a normal period but this time its shorter. Is it possible to get period twice and the gap was just for a few days?? Any thoughts on this?? Now my period supposedly to start on 12th November but it's still not coming. Maybe it's because of the bleeding. So i'm going to wait for a few days.

P/s: I took postinor 2 during my last period. So i think i had the bleeding after period stopped due to the side effect of the pill. And i was sexually active. Any thoughts??