i had sex last two days,which my bf was not sure if he released inside me,so i decided to use postinor 2 today,but this morning i discover two drops of blood,but after then i did not see blood again,and i had sex this evening my bf released inside me,i dont knw if i should still use the postinor.......please i dont want to get pregnant,and i dont know if the blood i saw was menstration and am also having pains