Thanks for the query.
As you had unprotected intercourse
around the time of ovulation there is possibility of pregnancy
So the spotting you are having could be implantation
But just by that we cannot confirm or rule out pregnancy.
To undergo pregnancy test you have to wait till your expected date of periods.
If you miss the periods, wait for 3 to 4 day and go for pregnancy test.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429