Hi Im Kim Me And My Boyfriend Had Sex Last

Hi im kim me and my boyfriend had sex last march 5 it is 5 days before ill start my period i took nordete 4pills after 20 -30 mins as ecp and another after 12 hours. We used withdrawal method the question is until now march 17 i still dont have any bleeding. Am i pregnant? I tool pt last march 15 supposed to be my last day if i have period but it is negative is it side effect of ecp or am i pregnant