Thanks for the query.
If you had unprotected intercourse
during the time of ovulation then there is possibility of pregnancy
And as you told periods can get delayed due to hormonal
So you once go for pregnancy test now.
If the test comes negative, wait for few more days possibly by that time you will get periods.
If not consult gynecologist and take tablets for withdrawal bleeding.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429