M i pregnant

Patient: Hello Doctor,i had saw my last menses on 9th november n i had unprotected sex with my boyfriend on 18th n he ejaculated inside me n i took postinor 2 tablet immediately and the next day 19th november i took another dose of postinor . today 24th of Npvember i ve been experiencing pains in my lower abdomen n i saw blood on my pants. please what does it mean? i took a pregnancy urine test n it came out negative. what do i do?