Hello, I Had My Last Period 21 January And It

Hello, i had my last period 21 january and it ended by 25th. I had sex with my bf on 30th january, we had used condom but somehow it tear, and due to that my bf cummed inside me, later within an hour i took i pill. I have heard that taking i pill on fertile day wont be effective is it true? And i am not having any side effects after taking i pill. When should i expect my next period? Help me please.