Hello, I Started My Periods On 25th Dec 2015 Which

Hello, I started my periods on 25th Dec 2015 which lasted for 4 days. I had unprotected sex on the 3rd of Jan at around 5am and again at 11am same day. I delayed to take epill and took postinor 2 on 3rd at 9am. On 12th as I was doing my sit ups i felt my periods. Checked it was some light one as when starting my periods. Went on for 3 days then reduced to spotting...now its more than 10days and I am still spotting. Is this normal or something is wrong with me?