Hello Doctor.my Name Is Nusrat And I Am 25 Years

hello doctor.my name is nusrat and i am 25 years ols.my problem is that i have missed my period of this month.it is already 13 day passed.last month i had sex with my husband.but i take the ipill within 2 hour.yesterday i test a home pregnancy test and it was negative.but still a dont have my periods.so what should i do now