In the current scenario, the delay in your period is possibly stress
and not anything else. If you have regular 28-30 day cycles, then you had unprotected intercourse
during the safe period. Please remember, condoms have a failure rate of up to 15% and if you do not wish to get pregnant, it would be better if you add some other mode of contraception
suitable to you. You can take a pregnancy
test within a week with a fresh early morning sample of urine to exclude/confirm pregnancy. See your doctor for further support. Good luck.