Is Pregnancy Possible If The Intercourse Is Just Before Menstruation?

Hello doctor, is it possible to conceive one day after due periods?I am 22 years old, my periods are fairly regular since i started exercising but since past two months i have left exercise. In October my periods were already late by a day and i had an unprotected intercourse one day after due date( i.e on.26 oct), also i took an emergency contraceptive after 48 hours(28 oct), and now its been a week since i took the emergency contraceptive but i still haven't got my periods(5 nov) which means my periods are late by more than a week Earlier once when i took an emergency contraceptive under similar situation my periods were exactly one week late.But this time its been more than a week so Is there a possibility of pregnancy?
Also along with it i got infected with urinary tract infection so i had to take those medicines for 5 days which ended yesterday.(4 nov)