My Period Ended On 13th I Had Unprotected Sex On

My period ended on 13th I had unprotected sex on 12th ....but just took Andrew liver salt then on 19th which was meant to be the beginning of my fertile day I had unprotected sex around 5:30pm then , took postinor 2 on 20th around 11:00 am but ....am scared because I took the two at once ...will it still work and what is my chances of getting pregnant ..my menstrual cycle is 28 to 30..