Thanks for the query.
If you had unprotected intercourse
around the time of ovulation then there is possibility of pregnancy
But just by symptoms we cannot confirm or exclude the pregnancy.
You may be having some post-coital tear, that is hurting during the intercourse.
So you once consult gynecologist, get examined and find out the cause for your problem.
And take treatment accordingly.
Better to use some regular contraceptive
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429