I'm married by September, since I'm studying we postponed of having a child, but unknowingly by October 30th, we had sex but his sperm did not entered in me. After 8 days by November 7th I got my periods regularly for 5 days, this month I have to get my periods by 7th or 8th, but its postponed till now almost 8 days, is there any chase of me being pregnant, since my exams are going on now I can't go for a check, please help me

Yes you could be pregnant from pre ejaculation. Wait a week or 2, if you still don't get your period see a dr.