Hi, Thanks for the query. If you had unprotected intercourse at the time of ovulation then there is possibility of pregnancy. But delay in periods always may not indicate pregnancy and that can occur due to many causes. Birth control pills can act as emergency pill when taken in sufficient dosage but they should be taken within 72 hours of the intercourse. So now you check for pregnancy once with the kit and depending o the result proceed further. For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429 Take care.