Hi My Bf An I Had Sex On The 11

Hi my bf an i had sex on the 11 oct it was my first time having sex an my bf pulled out an didn't cum inside but he's cum quick in the morning I took postinor 2 in case of any cum that got inside an the next one after 12 hrs stated I wana know if worked an my period is due till 28 Oct how can I know if it was effective?I'm scared I'm 20 yrs old an still live with my parents don't want put them through any shame I can't wait till my period date to know if I'm pregnant an I don't want to abort a life also help please thank you!