Hi, I Had Unprotected Sex With My Boyfriend 4days After

Hi, I had unprotected sex with my boyfriend 4days after my period and had unprotected sex again about 6days after my period to where I took an emergency pill 30min after that and took the next pill 12hrs later as per instruction but later that even I had unprotected sex again. Now it happens that I'm having my periods 12 days after my last period. What could be the problem?