Thanks for the query.
there is possibility of some amount of hormonal
fluctuation and it will take some time for regularization of periods.
So you have to use some contraceptive
Just by symptoms we cannot confirm or exclude the pregnancy
And urine pregnancy test kits may not detect very early pregnancy.
So you wait for 4 to 5 days. If you do not periods by that time, go for pregnancy test.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429