How Often Can Postinor Be Taken After Having Unsafe Sex?

Hi,i took postinor 2 just 5days after my periods and after 10days i started menestrating again,after my periods,i have had unprotected sex by mistake again..the condom broke,is it okay for me to use postinor again....just with one month although my periods came iregularly,its 4days after my periods and i dont know wether the safedays can help