I Had Sex With My Bf On 8th Day After

I had sex with my bf on 8th day after my periods. That is I had my periods from 4 to 8 of last month and we had sex on 16 th of the same month. First he put his penis inside with out condum. And he withdrew it before he ejaculates. Then he again put his penis inside two more times and that was with condum. And I take the emergency contraceptive pill immediately after one hour also. Next week for three days I had stomach pain as I have in my periods. After that for three days small bleeding also. Not like periods, it was a brownish fluid and that was not continues one these three days. Now it is one month after my last periods. Till now my periods didn't start. My period is not regular. Why it is getting late.